diff --git a/build_scripts/installer-version.py b/build_scripts/installer-version.py
index da0a93bc903f..0760ef144d8f 100644
--- a/build_scripts/installer-version.py
+++ b/build_scripts/installer-version.py
@@ -4,7 +4,7 @@ from setuptools_scm import get_version
 
 
 # example: 1.0b5.dev225
-def main():
+def main() -> None:
     scm_full_version = get_version(root="..", relative_to=__file__)
     # scm_full_version = "1.0.5.dev22"