diff --git a/drawing.lisp b/drawing.lisp
index 1977fbc..06cbc33 100644
--- a/drawing.lisp
+++ b/drawing.lisp
@@ -73,8 +73,8 @@
 (defclass graphics-context ()
   (window
    renderer
-   (width :initarg :width :initform 800)
-   (height :initarg :height :initform 600)))
+   (width :initarg :width)
+   (height :initarg :height)))
 
 (defmethod initialize-instance :after ((ctx graphics-context) &key)
   (with-slots (window renderer width height) ctx