diff --git a/acconfig.h.in b/acconfig.h.in
index 3293480f918..432aeac76ba 100644
--- a/acconfig.h.in
+++ b/acconfig.h.in
@@ -89,10 +89,6 @@
 /* Define if your Apache has src/include/ap_compat.h */
 #define HAVE_AP_COMPAT_H 0
 
-#ifndef DEBUG /* should be set to ZEND_DEBUG */
-#define DEBUG 0
-#endif
-
 /* Define if you want to enable PHP RPC (experimental) */
 #define PHP_RPC 0