diff --git a/vm_dump.c b/vm_dump.c
index 19070d13ab..ad965ca9c9 100644
--- a/vm_dump.c
+++ b/vm_dump.c
@@ -36,12 +36,6 @@
 #include "iseq.h"
 #include "vm_core.h"
 
-
-/* see vm_core.h for the values */
-#ifndef VMDEBUG
-#define VMDEBUG 0
-#endif
-
 #define MAX_POSBUF 128
 
 #define VM_CFP_CNT(ec, cfp) \