diff --git a/src/richtext/richtextbuffer.cpp b/src/richtext/richtextbuffer.cpp
index 4ffa494e37..079912028c 100644
--- a/src/richtext/richtextbuffer.cpp
+++ b/src/richtext/richtextbuffer.cpp
@@ -2561,7 +2561,9 @@ bool wxRichTextParagraphLayoutBox::SetListStyle(const wxRichTextRange& range, wx
 {
     bool withUndo = ((flags & wxRICHTEXT_SETSTYLE_WITH_UNDO) != 0);
     // bool applyMinimal = ((flags & wxRICHTEXT_SETSTYLE_OPTIMIZE) != 0);
+#ifdef __WXDEBUG__
     bool specifyLevel = ((flags & wxRICHTEXT_SETSTYLE_SPECIFY_LEVEL) != 0);
+#endif // __WXDEBUG__
     bool renumber = ((flags & wxRICHTEXT_SETSTYLE_RENUMBER) != 0);
 
     // Current number, if numbering