diff --git a/.travis.yml b/.travis.yml
index f969822..21353f5 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -14,8 +14,8 @@ install:
 
   # Google App Engine dependencies
   - cd ..
-  - wget https://storage.googleapis.com/appengine-sdks/featured/go_appengine_sdk_linux_amd64-1.9.19.zip
-  - unzip -q go_appengine_sdk_linux_amd64-1.9.19.zip
+  - wget https://storage.googleapis.com/appengine-sdks/featured/go_appengine_sdk_linux_amd64-1.9.20.zip
+  - unzip -q go_appengine_sdk_linux_amd64-1.9.20.zip
   - export PATH=$PATH:$PWD/go_appengine/
   - cd cayley
 
diff --git a/graph/memstore/iterator.go b/graph/memstore/iterator.go
index fb82a9f..68f47bb 100644
--- a/graph/memstore/iterator.go
+++ b/graph/memstore/iterator.go
@@ -34,10 +34,6 @@ type Iterator struct {
 	err    error
 }
 
-func cmp(a, b int64) int {
-	return int(a - b)
-}
-
 func NewIterator(tree *b.Tree, data string, qs *QuadStore) *Iterator {
 	iter, err := tree.SeekFirst()
 	if err != nil {
diff --git a/graph/memstore/quadstore.go b/graph/memstore/quadstore.go
index 9807c6e..fcf9753 100644
--- a/graph/memstore/quadstore.go
+++ b/graph/memstore/quadstore.go
@@ -35,6 +35,10 @@ func init() {
 	}, nil, nil)
 }
 
+func cmp(a, b int64) int {
+	return int(a - b)
+}
+
 type QuadDirectionIndex struct {
 	index [4]map[int64]*b.Tree
 }