diff --git a/config/http_config.go b/config/http_config.go
index ba7798ac..077ca046 100644
--- a/config/http_config.go
+++ b/config/http_config.go
@@ -11,6 +11,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+// +build go1.8
+
 package config
 
 import (
diff --git a/config/http_config_test.go b/config/http_config_test.go
index 840fd520..1928f2ad 100644
--- a/config/http_config_test.go
+++ b/config/http_config_test.go
@@ -11,6 +11,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+// build go1.8
+
 package config
 
 import (
@@ -544,7 +546,6 @@ func TestBasicAuthPasswordFile(t *testing.T) {
 }
 
 func getCertificateBlobs(t *testing.T) map[string][]byte {
-	t.Helper()
 	files := []string{
 		TLSCAChainPath,
 		BarneyCertificatePath,
diff --git a/config/tls_config_test.go b/config/tls_config_test.go
index a33b072a..fadd2484 100644
--- a/config/tls_config_test.go
+++ b/config/tls_config_test.go
@@ -11,6 +11,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+// build go1.8
+
 package config
 
 import (