diff --git a/vm/cpu-x86.h b/vm/cpu-x86.h
index a535038eef..63bf2b08e1 100644
--- a/vm/cpu-x86.h
+++ b/vm/cpu-x86.h
@@ -28,5 +28,6 @@ FASTCALL void undefined(CELL word);
 FASTCALL void dosym(CELL word);
 FASTCALL void docol_profiling(CELL word);
 FASTCALL void docol(CELL word);
+FASTCALL void lazy_jit_compile(CELL quot);
 
 void set_callstack(F_STACK_FRAME *to, F_STACK_FRAME *from, CELL length, void *memcpy);