diff --git a/synthtool/gcp/common.py b/synthtool/gcp/common.py
index b991da35f..e9c7a4148 100644
--- a/synthtool/gcp/common.py
+++ b/synthtool/gcp/common.py
@@ -94,7 +94,7 @@ def node_library(self, **kwargs) -> Path:
         kwargs["publish_token"] = node.get_publish_token(kwargs["metadata"]["name"])
 
         # generate root-level `src/index.ts` to export multiple versions and its default clients
-        if kwargs["versions"] and kwargs["default_version"]:
+        if "versions" in kwargs and "default_version" in kwargs:
             node.generate_index_ts(
                 versions=kwargs["versions"], default_version=kwargs["default_version"]
             )