diff --git a/src/lib/config/interfaces.ts b/src/lib/config/interfaces.ts
index 8fa6023f9..c9593b329 100644
--- a/src/lib/config/interfaces.ts
+++ b/src/lib/config/interfaces.ts
@@ -127,6 +127,7 @@ export interface Config {
     usernameField: string;
     useridField: string;
     tlsca: string;
+    starttls?: boolean;
     tlsOptions: {
       ca: string[];
     };