diff --git a/graph/gaedatastore/quadstore_test.go b/graph/gaedatastore/quadstore_test.go
index b27be1e..b32f6a2 100644
--- a/graph/gaedatastore/quadstore_test.go
+++ b/graph/gaedatastore/quadstore_test.go
@@ -10,6 +10,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+// +build appengine
 
 package gaedatastore