1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/util/versionstring.py b/synapse/util/versionstring.py
index cb08af7385..1c20b24bbe 100644
--- a/synapse/util/versionstring.py
+++ b/synapse/util/versionstring.py
@@ -19,7 +19,7 @@ import subprocess
 logger = logging.getLogger(__name__)
 
 
-def get_version_string(module):
+def get_version_string(module) -> str:
     """Given a module calculate a git-aware version string for it.
 
     If called on a module not in a git checkout will return `__verison__`.