diff --git a/ext/ldap/ldap.c b/ext/ldap/ldap.c
index c1d7619a0ef..fb1f4592a2b 100644
--- a/ext/ldap/ldap.c
+++ b/ext/ldap/ldap.c
@@ -31,7 +31,7 @@
 #include "ext/standard/dl.h"
 #include "php_ldap.h"
 
-#if WIN32|WINNT
+#ifdef PHP_WIN32
 #include <string.h>
 #if HAVE_NSLDAP
 #include <winsock.h>