diff --git a/collects/handin-server/overridden-collects/fake-teachpack/htdp/guess.ss b/collects/handin-server/overridden-collects/fake-teachpack/htdp/guess.ss
index 757c4a8144..cb91164b02 100644
--- a/collects/handin-server/overridden-collects/fake-teachpack/htdp/guess.ss
+++ b/collects/handin-server/overridden-collects/fake-teachpack/htdp/guess.ss
@@ -11,9 +11,6 @@
 (define-higher-order-primitive guess-with-gui-list guess-with-gui-list/proc
   (_ check-guess-list))
 
-(define (convert guesses:vec)
-  (void))
-
 (define (guess-with-gui/proc cg)
   (check-proc 'guess-with-gui cg 2 'first "two arguments")
   (void))
diff --git a/collects/handin-server/overridden-collects/fake-teachpack/htdp/master.ss b/collects/handin-server/overridden-collects/fake-teachpack/htdp/master.ss
new file mode 100644
index 0000000000..e951b5380b
--- /dev/null
+++ b/collects/handin-server/overridden-collects/fake-teachpack/htdp/master.ss
@@ -0,0 +1,11 @@
+#lang scheme/gui
+
+(require htdp/error lang/prim)
+
+(provide master)
+
+(define-higher-order-primitive master master/proc (compare-guess))
+
+(define (master/proc cg)
+  (check-proc 'master cg 4 'first 'arguments)
+  (void))