1 files changed, 1 insertions, 1 deletions
diff --git a/src/gui/widgets/button.h b/src/gui/widgets/button.h
index a2333d581..3dd783e52 100644
--- a/src/gui/widgets/button.h
+++ b/src/gui/widgets/button.h
@@ -107,7 +107,7 @@ class Button final : public gcn::Button,
         /**
          * Update the alpha value to the button components.
          */
-        void updateAlpha();
+        static void updateAlpha();
 
         void mouseReleased(gcn::MouseEvent& mouseEvent) override final;