diff --git a/include/wx/msw/wince/time.h b/include/wx/msw/wince/time.h
index 983eaf3eed..cb027d176f 100644
--- a/include/wx/msw/wince/time.h
+++ b/include/wx/msw/wince/time.h
@@ -9,6 +9,8 @@
 
 #ifndef _TM_DEFINED
 
+#define _TM_DEFINED
+
 struct tm {
         int tm_sec;     /* seconds after the minute - [0,59] */
         int tm_min;     /* minutes after the hour - [0,59] */