diff --git a/script/ci-custom.py b/script/ci-custom.py
index bc1ebda93b..6b01623d92 100755
--- a/script/ci-custom.py
+++ b/script/ci-custom.py
@@ -501,7 +501,7 @@ def lint_constants_usage():
             continue
         errs.append(
             f"Constant {highlight(constant)} is defined in {len(uses)} files. Please move all definitions of the "
-            f"constant to const.py (Uses: {', '.join(uses)}) in a separate PR. "
+            f"constant to const.py (Uses: {', '.join(str(u) for u in uses)}) in a separate PR. "
             "See https://developers.esphome.io/contributing/code/#python"
         )
     return errs