diff --git a/src/Renderer.zig b/src/Renderer.zig
index d7ba898..a267429 100644
--- a/src/Renderer.zig
+++ b/src/Renderer.zig
@@ -106,8 +106,8 @@ pub fn setColor(self: *Self, r: u8, g: i32, b: i32, a: i32) void {
 pub fn drawRectangle(self: *Self, x: i32, y: i32, w: i32, h: i32) void {
     self.fillRectangle(x, y, 1, h);
     self.fillRectangle(x, y, w, 1);
-    self.fillRectangle(w+x, y, 1, h);
-    self.fillRectangle(x, h+y, w, 1);
+    self.fillRectangle(w+x-1, y, 1, h);
+    self.fillRectangle(x, h+y-1, w, 1);
 }
 
 pub fn fillRectangle(self: *Self, x: i32, y: i32, w: i32, h: i32) void {