--- a/find/parser.c
+++ b/find/parser.c
@@ -67,12 +67,12 @@
 #include "findutils-version.h"
 #include "system.h"
 
-
-#ifndef HAVE_ENDGRENT
-# define endgrent ()
+#if ! HAVE_ENDGRENT
+# define endgrent() ((void) 0)
 #endif
-#ifndef HAVE_ENDPWENT
-# define endpwent ()
+
+#if ! HAVE_ENDPWENT
+# define endpwent() ((void) 0)
 #endif
 
 static bool parse_accesscheck   (const struct parser_table*, char *argv[], int *arg_ptr);