diff --git a/src/cli/definitions/parse-server.js b/src/cli/definitions/parse-server.js
index 7bd1aff0..54b49aef 100644
--- a/src/cli/definitions/parse-server.js
+++ b/src/cli/definitions/parse-server.js
@@ -201,7 +201,7 @@ export default {
     action: booleanParser
   },
   "cluster": {
-    env: PARSE_SERVER_CLUSTER,
+    env: "PARSE_SERVER_CLUSTER",
     help: "Run with cluster, optionally set the number of processes default to os.cpus().length",
     action: numberOrBoolParser("cluster")
   },