diff --git a/endpoint.go b/endpoint.go
index 702193d..6be7fe6 100644
--- a/endpoint.go
+++ b/endpoint.go
@@ -526,21 +526,23 @@ func (ep *endpoint) updateDNS(resolvConf []byte) error {
 		return ErrNoContainer
 	}
 
+	oldHash := []byte{}
 	hashFile := container.config.resolvConfPath + ".hash"
-	oldHash, err := ioutil.ReadFile(hashFile)
-	if err != nil {
-		if !os.IsNotExist(err) {
-			return err
-		}
-
-		oldHash = []byte{}
-	}
 
 	resolvBytes, err := ioutil.ReadFile(container.config.resolvConfPath)
 	if err != nil {
 		if !os.IsNotExist(err) {
 			return err
 		}
+	} else {
+		oldHash, err = ioutil.ReadFile(hashFile)
+		if err != nil {
+			if !os.IsNotExist(err) {
+				return err
+			}
+
+			oldHash = []byte{}
+		}
 	}
 
 	curHash, err := ioutils.HashData(bytes.NewReader(resolvBytes))
diff --git a/libnetwork_test.go b/libnetwork_test.go
index 2a020ad..d15d200 100644
--- a/libnetwork_test.go
+++ b/libnetwork_test.go
@@ -995,6 +995,7 @@ func TestEnableIPv6(t *testing.T) {
 	}
 
 	resolvConfPath := "/tmp/libnetwork_test/resolv.conf"
+	defer os.Remove(resolvConfPath)
 
 	_, err = ep1.Join(containerID,
 		libnetwork.JoinOptionResolvConfPath(resolvConfPath))
@@ -1061,6 +1062,7 @@ func TestResolvConf(t *testing.T) {
 	}
 
 	resolvConfPath := "/tmp/libnetwork_test/resolv.conf"
+	defer os.Remove(resolvConfPath)
 
 	_, err = ep1.Join(containerID,
 		libnetwork.JoinOptionResolvConfPath(resolvConfPath))