diff --git a/src/input.zig b/src/input.zig
index 8252b84..b294260 100644
--- a/src/input.zig
+++ b/src/input.zig
@@ -36,8 +36,8 @@ pub const Mouse = packed struct {
     }
 
     pub fn in(this: @This(), origin: Point, size: Point) bool {
-        return this.x >= origin.x and this.x <= size.x + origin.x and
-            this.y >= origin.y and this.y <= size.y + origin.y;
+        return this.x >= origin.x and this.x < size.x + origin.x and
+            this.y >= origin.y and this.y < size.y + origin.y;
     }
 };