diff --git a/test/images/network-tester/Makefile b/test/images/network-tester/Makefile
index 6392da48f67..f1de44bc9d6 100644
--- a/test/images/network-tester/Makefile
+++ b/test/images/network-tester/Makefile
@@ -12,13 +12,13 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-TAG = 1.6
+TAG = 1.7
 PREFIX = gcr.io/google_containers
 
 all: push
 
 webserver: webserver.go
-	CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -ldflags '-w' ./webserver.go
+	CGO_ENABLED=0 GOOS=linux godep go build -a -installsuffix cgo -ldflags '-w' ./webserver.go
 
 container: image
 
diff --git a/test/images/network-tester/webserver.go b/test/images/network-tester/webserver.go
index 67482a7ad0b..bc00b5cdeea 100644
--- a/test/images/network-tester/webserver.go
+++ b/test/images/network-tester/webserver.go
@@ -90,7 +90,8 @@ func (s *State) serveStatus(w http.ResponseWriter, r *http.Request) {
 		fmt.Fprintf(w, "running")
 		return
 	}
-	s.Logf("Declaring failure for %s/%s with %d sent and %d received and %d peers", *namespace, *service, len(s.Sent), len(s.Received), *peerCount)
+	// Logf can't be called while holding the lock, so defer using a goroutine
+	go s.Logf("Declaring failure for %s/%s with %d sent and %d received and %d peers", *namespace, *service, len(s.Sent), len(s.Received), *peerCount)
 	fmt.Fprintf(w, "fail")
 }