diff --git a/include/wx/checkbox.h b/include/wx/checkbox.h
index 6177aeb5d4..3ecfb6169f 100644
--- a/include/wx/checkbox.h
+++ b/include/wx/checkbox.h
@@ -41,18 +41,6 @@
  */
 #define wxCHK_ALLOW_3RD_STATE_FOR_USER 0x2000
 
-/*
- * The possible states of a 3-state checkbox (Compatible
- * with the 2-state checkbox).
- */
-enum wxCheckBoxState
-{
-    wxCHK_UNCHECKED,
-    wxCHK_CHECKED,
-    wxCHK_UNDETERMINED /* 3-state checkbox only */
-};
-
-
 extern WXDLLIMPEXP_DATA_CORE(const char) wxCheckBoxNameStr[];
 
 // ----------------------------------------------------------------------------
diff --git a/include/wx/defs.h b/include/wx/defs.h
index 0fcac961c8..e2e80ec3b2 100644
--- a/include/wx/defs.h
+++ b/include/wx/defs.h
@@ -2235,6 +2235,18 @@ enum wxItemKind
     wxITEM_MAX
 };
 
+/*
+ * The possible states of a 3-state checkbox (Compatible
+ * with the 2-state checkbox).
+ */
+enum wxCheckBoxState
+{
+    wxCHK_UNCHECKED,
+    wxCHK_CHECKED,
+    wxCHK_UNDETERMINED /* 3-state checkbox only */
+};
+
+
 /*  hit test results */
 enum wxHitTest
 {