--- a/hedgewars/hwengine.pas	Sat Sep 30 20:31:07 2017 +0200
+++ b/hedgewars/hwengine.pas	Sat Sep 30 21:54:47 2017 +0200
@@ -243,7 +243,8 @@
                 SDL_MOUSEWHEEL:
                     begin
                     wheelEvent:= true;
-                    ProcessMouseWheel(event.wheel.x, event.wheel.y);
+                    //ProcessMouseWheel(event.wheel.x, event.wheel.y);
+                    ProcessMouseWheel(event.wheel.y);
                     end;
 {$ENDIF}