diff --git a/src/core/windows7thumbbar.cpp b/src/core/windows7thumbbar.cpp
index e784cacf..d55a73f8 100644
--- a/src/core/windows7thumbbar.cpp
+++ b/src/core/windows7thumbbar.cpp
@@ -98,7 +98,7 @@ ITaskbarList3 *Windows7ThumbBar::CreateTaskbarList() {
 void Windows7ThumbBar::SetupButton(const QAction *action, THUMBBUTTON *button) {
 
   if (action) {
-    button->hIcon = qt_pixmapToWinHICON(action->icon().pixmap(Windows7ThumbBar::kIconSize));
+    button->hIcon = qt_pixmapToWinHICON(action->icon().pixmap(kIconSize));
     button->dwFlags = action->isEnabled() ? THBF_ENABLED : THBF_DISABLED;
     // This is unsafe - doesn't obey 260-char restriction
     action->text().toWCharArray(button->szTip);