diff --git a/mxsnoop/mxsnoop.sh b/mxsnoop/mxsnoop.sh
index a8d39a7..6445b24 100755
--- a/mxsnoop/mxsnoop.sh
+++ b/mxsnoop/mxsnoop.sh
@@ -27,7 +27,7 @@ BRIDGE=br01
 TRANSPARENT=${TRANSPARENT:-}
 STP=${STP:-}
 
-function die() { echo $1; exit 1; }
+function die() { echo "$1"; exit 1; }
 
 type ip > /dev/null || \
   die 'Error: Tools not available, check for ip command.'