diff --git a/acconfig.h b/acconfig.h
index bd5d6e258b..9c89097b37 100644
--- a/acconfig.h
+++ b/acconfig.h
@@ -65,9 +65,9 @@
 @BOTTOM@
 /* begin of postamble */
 
-#ifndef __NEEDS_PROTOTYPES
+#ifndef __NEED_PROTOTYPES
 /* force LDAP_P to always include prototypes */
-#define __NEEDS_PROTOTYPES 1
+#define __NEED_PROTOTYPES 1
 #endif
 
 #ifdef HAVE_STDDEF_H