diff --git a/exporters/metric/cortex/auth_test.go b/exporters/metric/cortex/auth_test.go
index a0283c83385..f3c31c23b97 100644
--- a/exporters/metric/cortex/auth_test.go
+++ b/exporters/metric/cortex/auth_test.go
@@ -12,6 +12,9 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+// Remove when #310 is resolved.
+// +build !386
+
 package cortex
 
 import (