diff --git a/SQCSim2021/openglcontext.cpp b/SQCSim2021/openglcontext.cpp
index cb78fb6..6421e95 100644
--- a/SQCSim2021/openglcontext.cpp
+++ b/SQCSim2021/openglcontext.cpp
@@ -56,6 +56,7 @@ bool OpenglContext::Start(const std::string& title, int width, int height, bool
                     else
                         MousePressEvent(MOUSE_BUTTON_WHEEL_DOWN, Event.mouseButton.x, Event.mouseButton.y);
                     break;
+                default: break;
             }
         }