diff --git a/cemutil.sh b/cemutil.sh
index fe57398..dbecab2 100755
--- a/cemutil.sh
+++ b/cemutil.sh
@@ -1,8 +1,13 @@
 #!/bin/bash
 
+if (( $EUID == 0 )); then
+	echo "Do not run as root."
+	exit 1
+fi
+
 if [ -z "$DISPLAY" ]; then
 	export DISPLAY=:0.0
-fi  
+fi
 
 # help function:
 function printhelp {