diff --git a/include/wx/generic/caret.h b/include/wx/generic/caret.h
index 8845f4cd8d..f9dd4d3866 100644
--- a/include/wx/generic/caret.h
+++ b/include/wx/generic/caret.h
@@ -18,6 +18,8 @@
 
 #if wxHAS_NATIVE_OVERLAY
     #define wxHAS_CARET_USING_OVERLAYS 1
+#else
+    #define wxHAS_CARET_USING_OVERLAYS 0
 #endif
 
 class WXDLLIMPEXP_CORE wxCaret;