diff --git a/source/lib/sysdep/win/wsdl.cpp b/source/lib/sysdep/win/wsdl.cpp
index 4129c66fa5..d307391645 100755
--- a/source/lib/sysdep/win/wsdl.cpp
+++ b/source/lib/sysdep/win/wsdl.cpp
@@ -703,6 +703,7 @@ static LRESULT OnMouseButton(HWND UNUSED(hWnd), UINT uMsg, int x, int y, UINT UN
 	case WM_MBUTTONUP:
 		button = SDL_BUTTON_MIDDLE;
 		state = SDL_RELEASED;
+		break;
 	default:
 		UNREACHABLE;
 	}