diff --git a/tests/datetime/datetimetest.cpp b/tests/datetime/datetimetest.cpp
index c8129a8127..3d4fad74d1 100644
--- a/tests/datetime/datetimetest.cpp
+++ b/tests/datetime/datetimetest.cpp
@@ -17,11 +17,12 @@
     #pragma hdrstop
 #endif
 
-#ifndef WX_PRECOMP
-#endif // WX_PRECOMP
-
 #if wxUSE_DATETIME
 
+#ifndef WX_PRECOMP
+    #include "wx/time.h"    // wxGetTimeZone()
+#endif // WX_PRECOMP
+
 #include "wx/wxcrt.h"       // for wxStrstr()
 
 #include "testdate.h"