diff --git a/src/racket/src/future.h b/src/racket/src/future.h
index 844ae96d0a..a03d930440 100644
--- a/src/racket/src/future.h
+++ b/src/racket/src/future.h
@@ -184,8 +184,6 @@ extern Scheme_Object *scheme_rtcall_make_future(const char *who, int src_type, S
 
 #endif 
 
-extern void scheme_on_demand_generate_lambda(Scheme_Native_Closure *nc, int argc, Scheme_Object **argv);
-
 void scheme_future_block_until_gc();
 void scheme_future_continue_after_gc();
 void scheme_check_future_work();
diff --git a/src/racket/src/schpriv.h b/src/racket/src/schpriv.h
index a50b1fee21..58c1646557 100644
--- a/src/racket/src/schpriv.h
+++ b/src/racket/src/schpriv.h
@@ -2681,6 +2681,10 @@ Scheme_Object *scheme_jit_expr(Scheme_Object *);
 Scheme_Object *scheme_jit_closure(Scheme_Object *, Scheme_Object *context);
 void scheme_jit_fill_threadlocal_table();
 
+#ifdef MZ_USE_JIT
+void scheme_on_demand_generate_lambda(Scheme_Native_Closure *nc, int argc, Scheme_Object **argv);
+#endif
+
 struct Start_Module_Args;
 
 #ifdef MZ_USE_JIT