diff --git a/Src/Mouse.cpp b/Src/Mouse.cpp
index c96d130b..61f71822 100644
--- a/Src/Mouse.cpp
+++ b/Src/Mouse.cpp
@@ -448,6 +448,9 @@ void Mouse::ProcessMessage(UINT message, WPARAM wParam, LPARAM lParam)
         case XBUTTON2:
             pImpl->mState.xButton2 = true;
             break;
+
+        default:
+            break;
         }
         break;
 
@@ -461,6 +464,9 @@ void Mouse::ProcessMessage(UINT message, WPARAM wParam, LPARAM lParam)
         case XBUTTON2:
             pImpl->mState.xButton2 = false;
             break;
+
+        default:
+            break;
         }
         break;