diff --git a/scripts/phpize.m4 b/scripts/phpize.m4
index d60d3df0c0f..388cb8bb6b8 100644
--- a/scripts/phpize.m4
+++ b/scripts/phpize.m4
@@ -102,6 +102,7 @@ PHP_SUBST(SHARED_LIBTOOL)
 PHP_SUBST(LIBTOOL)
 PHP_SUBST(SHELL)
 PHP_SUBST(AWK)
+PHP_SUBST(RE2C)
 
 PHP_GEN_BUILD_DIRS
 PHP_GEN_GLOBAL_MAKEFILE