diff --git a/libguile/jit.c b/libguile/jit.c
index dcab1f09f..86d33a238 100644
--- a/libguile/jit.c
+++ b/libguile/jit.c
@@ -4641,6 +4641,7 @@ compile (scm_jit_state *j)
 {
   j->ip = (uint32_t *) j->start;
   set_register_state (j, SP_IN_REGISTER | FP_IN_REGISTER);
+  j->frame_size = -1;
 
   for (ptrdiff_t offset = 0; j->ip + offset < j->end; offset++)
     j->labels[offset] = NULL;