diff --git a/.travis.yml b/.travis.yml
index 6fd624c0..6ec5732c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,6 +4,7 @@ go:
   - 1.5.4
   - 1.6.3
   - 1.7
+  - 1.8
 
 go_import_path: google.golang.org/grpc
 
diff --git a/test/end2end_test.go b/test/end2end_test.go
index 902bec42..4a7311c7 100644
--- a/test/end2end_test.go
+++ b/test/end2end_test.go
@@ -496,7 +496,7 @@ func (te *test) startServer(ts testpb.TestServiceServer) {
 	la := "localhost:0"
 	switch te.e.network {
 	case "unix":
-		la = "/tmp/testsock" + fmt.Sprintf("%d", time.Now())
+		la = "/tmp/testsock" + fmt.Sprintf("%d", time.Now().UnixNano())
 		syscall.Unlink(la)
 	}
 	lis, err := net.Listen(te.e.network, la)