diff --git a/host/chez/build.ss b/host/chez/build.ss
index bb36752..9f789a0 100644
--- a/host/chez/build.ss
+++ b/host/chez/build.ss
@@ -111,7 +111,7 @@
     'compile-eval
     "(load \"host/chez/png.ss\")"
     "(load \"host/chez/loader.ss\")"
-    "(load \"host/chez/ffi.ss\")"
+    "(load \"host/chez/java/ffi.ss\")"
     "(set-source-roots! (list \"jolt-core\" \"stdlib\"))"))
 
 (define bld-tagged-loads
diff --git a/host/chez/cli.ss b/host/chez/cli.ss
index 9f597cb..1d03c82 100644
--- a/host/chez/cli.ss
+++ b/host/chez/cli.ss
@@ -24,7 +24,7 @@
 ;; jolt.ffi host primitives (memory / library loading) load AFTER the loader's
 ;; baked-ns snapshot, so a library's (require '[jolt.ffi]) still loads jolt.ffi's
 ;; Clojure side (the foreign-fn / defcfn macros, stdlib/jolt/ffi.clj).
-(load "host/chez/ffi.ss")          ; jolt.ffi (FFI: a library binds native code)
+(load "host/chez/java/ffi.ss")          ; jolt.ffi (FFI: a library binds native code)
 
 ;; jolt.main + jolt.deps live under jolt-core; keep them (and stdlib) on the
 ;; roots so the CLI's own namespaces — and any jolt.* an app pulls in — resolve.
diff --git a/host/chez/async.ss b/host/chez/java/async.ss
similarity index 100%
rename from host/chez/async.ss
rename to host/chez/java/async.ss
diff --git a/host/chez/bigdec.ss b/host/chez/java/bigdec.ss
similarity index 100%
rename from host/chez/bigdec.ss
rename to host/chez/java/bigdec.ss
diff --git a/host/chez/byte-buffer.ss b/host/chez/java/byte-buffer.ss
similarity index 100%
rename from host/chez/byte-buffer.ss
rename to host/chez/java/byte-buffer.ss
diff --git a/host/chez/concurrency.ss b/host/chez/java/concurrency.ss
similarity index 100%
rename from host/chez/concurrency.ss
rename to host/chez/java/concurrency.ss
diff --git a/host/chez/dot-forms.ss b/host/chez/java/dot-forms.ss
similarity index 100%
rename from host/chez/dot-forms.ss
rename to host/chez/java/dot-forms.ss
diff --git a/host/chez/ffi.ss b/host/chez/java/ffi.ss
similarity index 100%
rename from host/chez/ffi.ss
rename to host/chez/java/ffi.ss
diff --git a/host/chez/host-class.ss b/host/chez/java/host-class.ss
similarity index 100%
rename from host/chez/host-class.ss
rename to host/chez/java/host-class.ss
diff --git a/host/chez/host-static-classes.ss b/host/chez/java/host-static-classes.ss
similarity index 100%
rename from host/chez/host-static-classes.ss
rename to host/chez/java/host-static-classes.ss
diff --git a/host/chez/host-static-methods.ss b/host/chez/java/host-static-methods.ss
similarity index 100%
rename from host/chez/host-static-methods.ss
rename to host/chez/java/host-static-methods.ss
diff --git a/host/chez/host-static.ss b/host/chez/java/host-static.ss
similarity index 100%
rename from host/chez/host-static.ss
rename to host/chez/java/host-static.ss
diff --git a/host/chez/inst-time.ss b/host/chez/java/inst-time.ss
similarity index 100%
rename from host/chez/inst-time.ss
rename to host/chez/java/inst-time.ss
diff --git a/host/chez/io-streams.ss b/host/chez/java/io-streams.ss
similarity index 100%
rename from host/chez/io-streams.ss
rename to host/chez/java/io-streams.ss
diff --git a/host/chez/io.ss b/host/chez/java/io.ss
similarity index 100%
rename from host/chez/io.ss
rename to host/chez/java/io.ss
diff --git a/host/chez/java-time.ss b/host/chez/java/java-time.ss
similarity index 100%
rename from host/chez/java-time.ss
rename to host/chez/java/java-time.ss
diff --git a/host/chez/math.ss b/host/chez/java/math.ss
similarity index 100%
rename from host/chez/math.ss
rename to host/chez/java/math.ss
diff --git a/host/chez/natives-array.ss b/host/chez/java/natives-array.ss
similarity index 100%
rename from host/chez/natives-array.ss
rename to host/chez/java/natives-array.ss
diff --git a/host/chez/natives-queue.ss b/host/chez/java/natives-queue.ss
similarity index 100%
rename from host/chez/natives-queue.ss
rename to host/chez/java/natives-queue.ss
diff --git a/host/chez/natives-str.ss b/host/chez/java/natives-str.ss
similarity index 100%
rename from host/chez/natives-str.ss
rename to host/chez/java/natives-str.ss
diff --git a/host/chez/records-interop.ss b/host/chez/java/records-interop.ss
similarity index 100%
rename from host/chez/records-interop.ss
rename to host/chez/java/records-interop.ss
diff --git a/host/chez/rt.ss b/host/chez/rt.ss
index 04b23ae..30929e7 100644
--- a/host/chez/rt.ss
+++ b/host/chez/rt.ss
@@ -259,7 +259,7 @@
 ;; the dispatchers/printers it wraps (collections/seq/values/converters/printing/
 ;; transients).
 (load "host/chez/records.ss")
-(load "host/chez/records-interop.ss")   ; exception hierarchy + instance-check taxonomy
+(load "host/chez/java/records-interop.ss")   ; exception hierarchy + instance-check taxonomy
 
 ;; metadata: meta / with-meta over an identity-keyed
 ;; side-table. After records.ss (jrec) + the collection ctors it copies.
@@ -268,7 +268,7 @@
 ;; host class tokens: bare class names (String/Keyword/File...) ->
 ;; canonical JVM class-name strings + (class x). After natives-meta.ss (jolt-type)
 ;; and the printer (jolt-str-render-one).
-(load "host/chez/host-class.ss")
+(load "host/chez/java/host-class.ss")
 
 ;; dynamic vars: *clojure-version* / *unchecked-math* constants the host
 ;; binds natively. After collections.ss (jolt-hash-map) + def-var!.
@@ -324,39 +324,39 @@
 ;; portable String/CharSequence surface record-method-dispatch falls through to on
 ;; a string target. After regex.ss (jolt-re-pattern/regex-t-irx) + records.ss
 ;; (which references jolt-string-method).
-(load "host/chez/natives-str.ss")
+(load "host/chez/java/natives-str.ss")
 
 ;; host class statics + constructors: host-static-ref/
 ;; host-static-call/host-new + the jhost method registry. Loads LAST — it extends
 ;; record-method-dispatch (records.ss) and reuses natives-str helpers (str-trim,
 ;; ascii-string-down, re-split, str-split-drop-trailing) + the regex-t accessors.
-(load "host/chez/host-static.ss")          ; registries + jhost + coercion helpers
-(load "host/chez/host-static-methods.ss")  ; Class/member static methods + fields
-(load "host/chez/host-static-classes.ss")  ; instantiable host object classes
-(load "host/chez/byte-buffer.ss")          ; java.nio.ByteBuffer over a byte-array
+(load "host/chez/java/host-static.ss")          ; registries + jhost + coercion helpers
+(load "host/chez/java/host-static-methods.ss")  ; Class/member static methods + fields
+(load "host/chez/java/host-static-classes.ss")  ; instantiable host object classes
+(load "host/chez/java/byte-buffer.ss")          ; java.nio.ByteBuffer over a byte-array
 
 ;; generic dot-form dispatch: field access + map/vector member access
 ;; for the `.` / `.-field` desugar. Loads after host-static.ss so it wraps every
 ;; record-method-dispatch arm (jhost/number/regex/jrec/string) and falls through.
-(load "host/chez/dot-forms.ss")
+(load "host/chez/java/dot-forms.ss")
 
 ;; java.io.File + host file I/O: path-backed jfile record, slurp/spit/
 ;; flush, file-seq dir primitives, clojure.java.io/file. Loads LAST so its jfile
 ;; arm wraps the fully-built record-method-dispatch and the str/type/instance-check
 ;; extensions sit over every prior shim.
-(load "host/chez/io.ss")
+(load "host/chez/java/io.ss")
 
 ;; #inst values + java.time formatting: jinst (RFC3339 ms) +
 ;; DateTimeFormatter/Instant/ZoneId/LocalDateTime/FormatStyle/Locale/Date. Loads
 ;; LAST — it extends record-method-dispatch / jolt-get / jolt= / jolt-hash /
 ;; jolt-pr-str / jolt-type / instance-check and uses host-static.ss's registries.
-(load "host/chez/inst-time.ss")
+(load "host/chez/java/inst-time.ss")
 
 ;; java.time value types: LocalDate / LocalTime / LocalDateTime / Instant as
 ;; tz-free jhost values (epoch-day / nano-of-day / epoch-ms). Loads after
 ;; inst-time.ss — it reuses its civil<->days helpers, the jhost registries, and
 ;; re-registers a few LocalDateTime/Instant statics to use the richer reps.
-(load "host/chez/java-time.ss")
+(load "host/chez/java/java-time.ss")
 
 ;; Chez-side data reader: read-string / __parse-next /
 ;; __read-tagged. Loads after inst-time.ss — __read-tagged reuses its #uuid/#inst
@@ -365,7 +365,7 @@
 
 ;; clojure.math: native flonum-math shims def-var!'d into the
 ;; clojure.math ns. Self-contained (only def-var! + Chez math), order-independent.
-(load "host/chez/math.ss")
+(load "host/chez/java/math.ss")
 
 ;; reader/macro runtime support: #?() feature set, reader-conditional + re-matcher
 ;; tagged-map ctors, macroexpand. After ns.ss; macroexpand call-time-refs the macro
@@ -375,17 +375,17 @@
 ;; Java-style arrays: object/typed array constructors + a jolt-array
 ;; backing; extends count/nth/seq/get/ref-put! so the overlay aget/aset/alength see
 ;; it. After the dispatchers it chains.
-(load "host/chez/natives-array.ss")
+(load "host/chez/java/natives-array.ss")
 
 ;; java.io byte/char streams (FileInputStream/…/ByteArrayOutputStream/Buffered*)
 ;; over Chez ports. After io.ss (extends its slurp/__close/reader-jhost?) and
 ;; natives-array.ss (the byte-array <-> bytevector bridge).
-(load "host/chez/io-streams.ss")
+(load "host/chez/java/io-streams.ss")
 
 ;; clojure.lang.PersistentQueue: a functional queue + EMPTY static.
 ;; Chains seq/count/empty?/peek/pop/conj/sequential?/class/instance?/printer, so
 ;; load after natives-array (the dispatchers it extends).
-(load "host/chez/natives-queue.ss")
+(load "host/chez/java/natives-queue.ss")
 
 ;; syntax-quote form builders: __sqcat/__sqvec/__sqmap/__sqset/
 ;; __sq1, def-var!'d into clojure.core. A cross-compiled macro expander (analyzer
@@ -397,14 +397,14 @@
 ;; (JVM) semantics. Loaded LAST — chains the fully-built jolt-deref and conveys the
 ;; thread-local binding stack (dyn-binding.ss) into workers. pmap/pcalls/pvalues
 ;; (overlay, over `future`) light up once future-call exists here.
-(load "host/chez/concurrency.ss")
+(load "host/chez/java/concurrency.ss")
 
 ;; clojure.core.async: real-thread blocking channels + go/go-loop/
 ;; thread macros, def-var!'d into clojure.core.async. After concurrency.ss (reuses
 ;; ms->duration) and the collection/seq layer.
-(load "host/chez/async.ss")
+(load "host/chez/java/async.ss")
 
 ;; BigDecimal: the jbigdec value type + bigdec/decimal?/class/equality/
 ;; printing. Loads LAST so its set!-wraps of jolt-class/jolt=2/the printers sit
 ;; outermost over every earlier extension.
-(load "host/chez/bigdec.ss")
+(load "host/chez/java/bigdec.ss")
diff --git a/jolt-core/clojure/core/21-coll.clj b/jolt-core/clojure/core/21-coll.clj
index dfaffe4..34e85fa 100644
--- a/jolt-core/clojure/core/21-coll.clj
+++ b/jolt-core/clojure/core/21-coll.clj
@@ -340,7 +340,7 @@
 
 (defn clojure-version [] "1.11.0-jolt")
 
-;; bigdec is a host fn (host/chez/bigdec.ss) — a real BigDecimal value type.
+;; bigdec is a host fn (host/chez/java/bigdec.ss) — a real BigDecimal value type.
 (defn numerator [x] (throw (ex-info "numerator requires a ratio (Jolt has no ratios)" {})))
 (defn denominator [x] (throw (ex-info "denominator requires a ratio (Jolt has no ratios)" {})))
 
diff --git a/jolt-core/jolt/analyzer.clj b/jolt-core/jolt/analyzer.clj
index 38fd559..19b3dd0 100644
--- a/jolt-core/jolt/analyzer.clj
+++ b/jolt-core/jolt/analyzer.clj
@@ -685,7 +685,7 @@
      ;; jolt-regex value over the vendored irregex.
      (form-regex? form) {:op :regex :source (form-regex-source form)}
      ;; #inst / #uuid literals -> :inst / :uuid IR leaves. The Chez back
-     ;; end emits a runtime inst/uuid value (host/chez/inst-time.ss).
+     ;; end emits a runtime inst/uuid value (host/chez/java/inst-time.ss).
      (form-inst? form) {:op :inst :source (form-inst-source form)}
      (form-uuid? form) {:op :uuid :source (form-uuid-source form)}
      ;; bigdecimal literal (1.5M) -> a :bigdec leaf; the back end emits a runtime
diff --git a/jolt-core/jolt/backend_scheme.clj b/jolt-core/jolt/backend_scheme.clj
index 6caa704..8478c71 100644
--- a/jolt-core/jolt/backend_scheme.clj
+++ b/jolt-core/jolt/backend_scheme.clj
@@ -350,7 +350,7 @@
        (ffi-type->chez (:rettype node)) ")"))
 
 ;; jolt.ffi/__ccallable -> a Chez foreign-callable wrapping the emitted jolt fn,
-;; locked + registered (jolt-ffi-register-callable!, host/chez/ffi.ss) so the
+;; locked + registered (jolt-ffi-register-callable!, host/chez/java/ffi.ss) so the
 ;; collector neither moves nor reclaims it while C may still call through it. The
 ;; expression evaluates to the entry-point address — a jolt pointer the caller
 ;; hands to C. :collect-safe emits the convention that reactivates the thread on
diff --git a/test/chez/ffi-binding-test.ss b/test/chez/ffi-binding-test.ss
index b53a178..0454f90 100644
--- a/test/chez/ffi-binding-test.ss
+++ b/test/chez/ffi-binding-test.ss
@@ -14,7 +14,7 @@
 (load "host/chez/host-contract.ss")
 (load "host/chez/seed/image.ss")
 (load "host/chez/compile-eval.ss")
-(load "host/chez/ffi.ss")
+(load "host/chez/java/ffi.ss")
 
 (define total 0) (define fails 0)
 (define (ok name pred) (set! total (+ total 1)) (unless pred (set! fails (+ fails 1)) (printf "FAIL: ~a\n" name)))