diff --git a/entrypoint.sh b/entrypoint.sh
index b334304..904aa0f 100755
--- a/entrypoint.sh
+++ b/entrypoint.sh
@@ -10,11 +10,11 @@
 echo "Processing event '$GITHUB_EVENT_NAME'"
 echo "List of files with absent license:"
 echo "==================================="
-if [ -n "$INPUT_INPUT_FILES" ]; then
-	export err=0
+if [[ -n "$INPUT_INPUT_FILES" ]]; then
+	err=0
     for file in $INPUT_INPUT_FILES; do
         echo /app/addlicense -check "$1" "$file" | sh
-        if [ $? -ne 0]; then
+        if [[ $? -ne 0]]; then
             err=$?
         fi
     done