diff --git a/vm_core.h b/vm_core.h
index ae49798898..e4a793365b 100644
--- a/vm_core.h
+++ b/vm_core.h
@@ -737,7 +737,7 @@ typedef struct rb_vm_struct {
 #endif
 
 #ifndef VM_DEBUG_VERIFY_METHOD_CACHE
-#define VM_DEBUG_VERIFY_METHOD_CACHE (VM_DEBUG_MODE != 0)
+#define VM_DEBUG_VERIFY_METHOD_CACHE (VMDEBUG != 0)
 #endif
 
 struct rb_captured_block {