diff --git a/nodemgmt-scripts.sh b/nodemgmt-scripts.sh
index 0eabe323..8ee2a60a 100755
--- a/nodemgmt-scripts.sh
+++ b/nodemgmt-scripts.sh
@@ -13,7 +13,7 @@ source /opt/idssys/nodemgmt/defaults.inc
 
 case "$1" in
 	service)
-		if ! containsElement "${2}" "${NM_SERVICES[@]}" ; then
+		if containsElement "${2}" "${NM_SERVICES[@]}" ; then
 			echo -e "${idsCL[Red]}(${2}) is not an allowed service.${idsCL[Default]}"
 			exit 1	
 		fi