diff --git a/files/bin/dz-common b/files/bin/dz-common
index 934dc09..9189e51 100755
--- a/files/bin/dz-common
+++ b/files/bin/dz-common
@@ -36,7 +36,7 @@ export cyan="\e[36m"
 export release_server_appid=223350
 
 # Allow for the use of experimental via an environment variable
-if [ ${EXPERIMENTAL} != "" ]
+if [[ ${EXPERIMENTAL} != "" ]]
 then
 	export release_server_appid=1042420
 fi