diff --git a/mjit.c b/mjit.c
index c993064aea..7bbc30f6c0 100644
--- a/mjit.c
+++ b/mjit.c
@@ -1123,7 +1123,7 @@ mjit_get_iseq_func(const struct rb_iseq_constant_body *body)
     struct timeval tv;
     tv.tv_sec = 0;
     tv.tv_usec = 1000;
-    while ((enum rb_mjit_iseq_func)body->jit_func == NOT_READY_JIT_ISEQ_FUNC) {
+    while (body->jit_func == (mjit_func_t)NOT_READY_JIT_ISEQ_FUNC) {
         CRITICAL_SECTION_START(3, "in mjit_get_iseq_func for a client wakeup");
         rb_native_cond_broadcast(&mjit_worker_wakeup);
         CRITICAL_SECTION_FINISH(3, "in mjit_get_iseq_func for a client wakeup");
diff --git a/mjit.h b/mjit.h
index 1a9f0ec6c7..9bf2a00913 100644
--- a/mjit.h
+++ b/mjit.h
@@ -103,7 +103,7 @@ mjit_exec(rb_execution_context_t *ec)
 
     func = body->jit_func;
     if (UNLIKELY(mjit_opts.wait && mjit_opts.min_calls == total_calls && mjit_target_iseq_p(body)
-                 && (enum rb_mjit_iseq_func)func == NOT_ADDED_JIT_ISEQ_FUNC)) {
+                 && func == (mjit_func_t)NOT_ADDED_JIT_ISEQ_FUNC)) {
         mjit_add_iseq_to_process(iseq);
         func = mjit_get_iseq_func(body);
     }