diff --git a/components/node/files/scripts/common.sh b/components/node/files/scripts/common.sh
index b6bb0ae..6d70018 100644
--- a/components/node/files/scripts/common.sh
+++ b/components/node/files/scripts/common.sh
@@ -22,7 +22,7 @@ getPrimaryInfo() {
         echo "Failed to get primary info for master '${masterName}'"
         return 1
     fi
-    if [ "${info}" =~ /^NULL/ ]; then
+    if [[ "${info}" =~ /^NULL/ ]]; then
         getPrimaryInfo
     fi
     echo "${info}"