diff --git a/modules/security/malware-scanner.sh b/modules/security/malware-scanner.sh
index 3dd9b14..90771c8 100755
--- a/modules/security/malware-scanner.sh
+++ b/modules/security/malware-scanner.sh
@@ -791,7 +791,7 @@ cleanup_on_exit() {
     fi
 
     # Save interrupted status (only if summary file directory exists)
-    if [ $exit_code -ne 0 ] && [ -d "$RESULTS_DIR" ]; then
+    if [ "$exit_code" -ne 0 ] && [ -d "$RESULTS_DIR" ]; then
         {
             echo ""
             echo "SCAN INTERRUPTED"