diff --git a/server-ce/config/custom-environment-variables.json b/server-ce/config/custom-environment-variables.json
index f65f74ae2b..feac03d270 100644
--- a/server-ce/config/custom-environment-variables.json
+++ b/server-ce/config/custom-environment-variables.json
@@ -50,12 +50,14 @@
     "history": {
       "host": "OVERLEAF_REDIS_HOST",
       "password": "OVERLEAF_REDIS_PASS",
-      "port": "OVERLEAF_REDIS_PORT"
+      "port": "OVERLEAF_REDIS_PORT",
+      "tls": "OVERLEAF_REDIS_TLS"
     },
     "lock": {
       "host": "OVERLEAF_REDIS_HOST",
       "password": "OVERLEAF_REDIS_PASS",
-      "port": "OVERLEAF_REDIS_PORT"
+      "port": "OVERLEAF_REDIS_PORT",
+      "tls": "OVERLEAF_REDIS_TLS"
     }
   }
 }