diff --git a/jolt-core/clojure/core/20-coll.clj b/jolt-core/clojure/core/20-coll.clj
index cce15e5..d201fda 100644
--- a/jolt-core/clojure/core/20-coll.clj
+++ b/jolt-core/clojure/core/20-coll.clj
@@ -209,17 +209,6 @@
 (defn rationalize [x] x)
 
 ;; trampoline: repeatedly calls f with args until a non-function result.
-(defn trampoline
-  ([f]
-   (let [ret (f)]
-     (if (ifn? ret)
-       (recur ret)
-       ret)))
-  ([f & args]
-   (let [ret (apply f args)]
-     (if (ifn? ret)
-       (recur ret)
-       ret))))
 
 ;; rand-int: random integer in [0, n). Uses Janet math/random.
 
diff --git a/src/jolt/core.janet b/src/jolt/core.janet
index c81508e..52f6fc6 100644
--- a/src/jolt/core.janet
+++ b/src/jolt/core.janet
@@ -1404,6 +1404,10 @@
 # subvec lives in the Clojure kernel tier — core/00-kernel.clj.
 
 
+(defn core-trampoline [f & args]
+  (var result (apply f args))
+  (while (function? result) (set result (result)))
+  result)
 (def core-format (fn [fmt & args] (string/format fmt ;args)))
 
 # ============================================================