diff --git a/run_node.sh b/run_node.sh
index f328217..fecdff5 100755
--- a/run_node.sh
+++ b/run_node.sh
@@ -2,7 +2,7 @@
 
 echo "I am a nwaku node"
 
-if test -n "${ETH_CLIENT_ADDRESS}" -o ; then
+if [ -n "${ETH_CLIENT_ADDRESS}" ] ; then
     echo "ETH_CLIENT_ADDRESS variable was renamed to RLN_RELAY_ETH_CLIENT_ADDRESS"
     echo "Please update your .env file"
     exit 1