diff --git a/action.yml b/action.yml
index 980c645..0d31e2f 100644
--- a/action.yml
+++ b/action.yml
@@ -41,7 +41,7 @@ runs:
         # across different git commits, since it may be at a different location
         # in different commits.
         export COMPARISON_TAG="${{ inputs.version-tag-prefix }}$("$GITHUB_ACTION_PATH/find_comparison_version.sh" "$PACKAGE_NAME")"
-        git fetch --depth=1 origin "$COMPARISON_TAG"
+        git fetch --depth=1 origin "+refs/tags/$COMPARISON_TAG:refs/tags/$COMPARISON_TAG"
         git checkout "$COMPARISON_TAG"
         cargo +nightly rustdoc -- -Zunstable-options --output-format json
         mv "$(cargo metadata --format-version 1 | jq -r .target_directory)/doc/$PACKAGE_NAME_WITH_UNDERSCORES.json" /tmp/baseline.json