diff --git a/scripts/_common.sh b/scripts/_common.sh
index 4fbc79a..a4669f9 100644
--- a/scripts/_common.sh
+++ b/scripts/_common.sh
@@ -5,7 +5,9 @@ ROCKETCHAT_SHASUM=ed53712b37571b959b5c8c8947d6335c21fced316f2b3174bfe027fa25700c
 NODE_VERSION=4.7.1
 
 checkcmd() {
-  curl -m 1 -s localhost:$port$path/api/v1/info | grep -e \"success.*true\" >/dev/null 2>&1
+  curl -m 1 -s localhost:$port$path/api/v1/info | \
+    python -c "import sys, json; print json.load(sys.stdin)['success']" | \
+    grep "True" >/dev/null 2>&1
 }
 
 waitforservice() {