diff --git a/prometheus/promhttp/instrument_client_1_8_test.go b/prometheus/promhttp/instrument_client_test.go
similarity index 99%
rename from prometheus/promhttp/instrument_client_1_8_test.go
rename to prometheus/promhttp/instrument_client_test.go
index 2d0ff4f..59c0a2f 100644
--- a/prometheus/promhttp/instrument_client_1_8_test.go
+++ b/prometheus/promhttp/instrument_client_test.go
@@ -11,8 +11,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// +build go1.8
-
 package promhttp
 
 import (