diff --git a/extras/src/main/java/edu/umd/cs/piccolox/PFrame.java b/extras/src/main/java/edu/umd/cs/piccolox/PFrame.java
index 6db74e7..69b214f 100644
--- a/extras/src/main/java/edu/umd/cs/piccolox/PFrame.java
+++ b/extras/src/main/java/edu/umd/cs/piccolox/PFrame.java
@@ -126,10 +126,10 @@
             this.canvas = canvas;
         }
 
-        setContentPane(canvas);
+        setContentPane(this.canvas);
         validate();
         setFullScreenMode(fullScreen);
-        canvas.requestFocus();
+        this.canvas.requestFocus();
         beforeInitialize();
 
         // Manipulation of Piccolo's scene graph should be done from Swings