1 files changed, 5 insertions, 0 deletions
diff --git a/src/gui/sdlinput.cpp b/src/gui/sdlinput.cpp
index 18e1802d9..847e2a060 100644
--- a/src/gui/sdlinput.cpp
+++ b/src/gui/sdlinput.cpp
@@ -304,6 +304,11 @@ MouseButton::Type SDLInput::convertMouseButton(const int button)
             return MouseButton::RIGHT;
         case SDL_BUTTON_MIDDLE:
             return MouseButton::MIDDLE;
+#ifndef USE_SDL2
+        case SDL_BUTTON_WHEELUP:
+        case SDL_BUTTON_WHEELDOWN:
+            return MouseButton::EMPTY;
+#endif
         default:
             // We have an unknown mouse type which is ignored.
             logger->log("unknown button type: %u", button);