diff --git a/src/entrypoint.sh b/src/entrypoint.sh
index fc38504..18ac250 100755
--- a/src/entrypoint.sh
+++ b/src/entrypoint.sh
@@ -12,7 +12,7 @@ echo "::add-matcher::matcher.json"
 
 # Custom path for yamllint configuration input
 if [[ -n "${INPUT_CONFIG}" ]]; then
-  if [[ -f "${INPUT_CONFIG}" ]]; then
+  if [[ ! -f "${INPUT_CONFIG}" ]]; then
     echo "::error ::Custom yamllint configuration file not found: ${INPUT_CONFIG}"
     exit 1
   fi