diff --git a/src/unix/utilsx11.cpp b/src/unix/utilsx11.cpp
index 97c8fa5560..bd611cd2fb 100644
--- a/src/unix/utilsx11.cpp
+++ b/src/unix/utilsx11.cpp
@@ -282,7 +282,7 @@ static void wxWinHintsSetLayer(Display *display, Window rootWnd,
 #ifdef __WXGTK20__
 static bool wxQueryWMspecSupport(Display* WXUNUSED(display),
                                  Window WXUNUSED(rootWnd),
-                                 Atom (feature))
+                                 Atom feature)
 {
     GdkAtom gatom = gdk_x11_xatom_to_atom(feature);
     return gdk_x11_screen_supports_net_wm_hint(gdk_screen_get_default(), gatom);