diff --git a/setup.py b/setup.py
index 8f1117f..fa67c78 100644
--- a/setup.py
+++ b/setup.py
@@ -27,7 +27,7 @@
         "grpcio",
         "protobuf",
         "googleapis-common-protos",
-        "importlib-metadata<5 ; python_version<='3.7'"
+        "importlib-metadata<5 ; python_version<='3.7'",
     ],
     extras_require={
         "dev": [