diff --git a/action.yml b/action.yml
index ed5a5d74..779de80b 100644
--- a/action.yml
+++ b/action.yml
@@ -132,3 +132,4 @@ runs:
         COVERALLS_REPO_TOKEN: ${{ inputs.github-token }}
         COVERALLS_COMPARE_REF: ${{ inputs.compare-ref }}
         COVERALLS_COMPARE_SHA: ${{ inputs.compare-sha }}
+        COVERALLS_SOURCE_HEADER: github-action