diff --git a/configure.ac b/configure.ac
index 81c7f9ccc3d..09cb2706bbc 100644
--- a/configure.ac
+++ b/configure.ac
@@ -10,7 +10,7 @@ dnl -------------------------------------------------------------------------
 
 AC_PREREQ([2.68])
 AC_INIT(README.GIT-RULES)
-ifdef([AC_PRESERVE_HELP_ORDER], [AC_PRESERVE_HELP_ORDER], [])
+AC_PRESERVE_HELP_ORDER
 
 PHP_CONFIG_NICE(config.nice)
 
diff --git a/scripts/phpize.m4 b/scripts/phpize.m4
index 55fa08d7c45..43cae33c2f1 100644
--- a/scripts/phpize.m4
+++ b/scripts/phpize.m4
@@ -2,7 +2,7 @@ dnl This file becomes configure.ac for self-contained extensions.
 
 AC_PREREQ([2.68])
 AC_INIT(config.m4)
-ifdef([AC_PRESERVE_HELP_ORDER], [AC_PRESERVE_HELP_ORDER], [])
+AC_PRESERVE_HELP_ORDER
 
 PHP_CONFIG_NICE(config.nice)