1 files changed, 2 insertions, 2 deletions
diff --git a/sdl.c b/sdl.c
index edd173e06c..1509397f10 100644
--- a/sdl.c
+++ b/sdl.c
@@ -312,8 +312,8 @@ static void sdl_send_mouse_event(int dz)
 	}
 
 	SDL_GetMouseState(&dx, &dy);
-	dx = dx * 0x7FFF / width;
-	dy = dy * 0x7FFF / height;
+	dx = dx * 0x7FFF / (width - 1);
+	dy = dy * 0x7FFF / (height - 1);
     } else if (absolute_enabled) {
 	sdl_show_cursor();
 	absolute_enabled = 0;