diff --git a/frustration.rs b/frustration.rs
index 43b7884..57da3d9 100644
--- a/frustration.rs
+++ b/frustration.rs
@@ -630,7 +630,7 @@ const PRIMITIVES: [Primitive; 16] = [
                  * Like the front panel with the blinking lights that Chuck
                  * talked about. */
 
-                println!("{:?} {:?}", x.dstack, x.rstack);
+                println!("{:?} {:?}", x.ip, x.dstack);
                 let _ = io::stdout().flush();
             }
             _ => {}