diff --git a/dlls/kernel/tests/timer.c b/dlls/kernel/tests/timer.c
index db6c5fd2679..d66e2b56e9d 100644
--- a/dlls/kernel/tests/timer.c
+++ b/dlls/kernel/tests/timer.c
@@ -18,6 +18,8 @@
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */
 
+#define _WIN32_WINNT 0x0501
+
 #include "wine/test.h"
 #include "winbase.h"