diff --git a/lib/tempest b/lib/tempest
index 906cb00..0e5f9c9 100644
--- a/lib/tempest
+++ b/lib/tempest
@@ -317,7 +317,7 @@
     iniset $TEMPEST_CONFIG network-feature-disabled api_extensions ${DISABLE_NETWORK_API_EXTENSIONS}
 
     # boto
-    iniset $TEMPEST_CONFIG boto ec2_url "http://$SERVICE_HOST:8773/services/Cloud"
+    iniset $TEMPEST_CONFIG boto ec2_url "$EC2_SERVICE_PROTOCOL://$SERVICE_HOST:8773/services/Cloud"
     iniset $TEMPEST_CONFIG boto s3_url "http://$SERVICE_HOST:${S3_SERVICE_PORT:-3333}"
     iniset $TEMPEST_CONFIG boto s3_materials_path "$BOTO_MATERIALS_PATH"
     iniset $TEMPEST_CONFIG boto ari_manifest cirros-${CIRROS_VERSION}-${CIRROS_ARCH}-initrd.manifest.xml