diff --git a/include/locale_io.h b/include/locale_io.h
index 154c741d63..431830076c 100644
--- a/include/locale_io.h
+++ b/include/locale_io.h
@@ -50,7 +50,7 @@ private:
     // The locale in use before switching to the "C" locale
     // (the locale can be set by user, and is not always the system locale)
     std::string m_user_locale;
-    #ifdef __GNUC__
+    #ifndef __clang__
     // [[maybe_unused]] attribute is ignored by Gcc but generates a warning.
     wxLocale*   m_wxLocale;
     #else