diff --git a/include/wx/defs.h b/include/wx/defs.h
index 75191a57e5..96ca1b6d9f 100644
--- a/include/wx/defs.h
+++ b/include/wx/defs.h
@@ -434,6 +434,12 @@ typedef int wxWindowID;
     #endif /* va_copy/!va_copy */
 #endif /* wxVaCopy */
 
+#ifndef HAVE_VARIADIC_MACROS
+    #if wxCHECK_WATCOM_VERSION(1,2)
+        #define HAVE_VARIADIC_MACROS
+    #endif
+#endif /* HAVE_VARIADIC_MACROS */
+
 
 /*  ---------------------------------------------------------------------------- */
 /*  portable calling conventions macros */