diff --git a/ext/mbstring/config.w32 b/ext/mbstring/config.w32
index 976b6cab165..28afe1153b3 100644
--- a/ext/mbstring/config.w32
+++ b/ext/mbstring/config.w32
@@ -46,7 +46,7 @@ if (PHP_MBSTRING != "no") {
 				AC_DEFINE('HAVE_MBREGEX', 1);
 
 				/* XXX libonig is only usable as a static library ATM, code change required to link with a DLL. */
-				ADD_FLAG("CFLAGS_MBSTRING", "/DONIG_EXTERN=extern /DPHP_ONIG_BAD_KOI8_ENTRY=1 /DZEND_ENABLE_STATIC_TSRMLS_CACHE=1 /utf-8");
+				ADD_FLAG("CFLAGS_MBSTRING", "/DONIG_EXTERN=extern /DPHP_ONIG_BAD_KOI8_ENTRY=1 /utf-8");
 
 				ADD_SOURCES("ext/mbstring", "php_mbregex.c", "mbstring");
 				PHP_INSTALL_HEADERS("ext/mbstring", "php_mbregex.h php_onig_compat.h");