diff --git a/config/config.example.json b/config/config.example.json
index c560bcf..2e0d5c7 100644
--- a/config/config.example.json
+++ b/config/config.example.json
@@ -6,7 +6,8 @@
     "name": "studybot",
     "auth": true,
     "username": "admin",
-    "password": "foobar"
+    "password": "foobar",
+    "authSource": "admin"
   },
 
   "web": {
diff --git a/src/models/config.ts b/src/models/config.ts
index 32a9bd9..dd61fd4 100644
--- a/src/models/config.ts
+++ b/src/models/config.ts
@@ -22,6 +22,7 @@ export interface DatabaseConfig {
   auth: boolean;
   username?: string;
   password?: string;
+  authSource?: string;
 }
 
 export interface WebConfig {
diff --git a/src/services/config.ts b/src/services/config.ts
index bf72fff..cb69cdf 100644
--- a/src/services/config.ts
+++ b/src/services/config.ts
@@ -71,6 +71,9 @@ export class ConfigService {
       if(!this.config.database.password) {
         throw Error("Database auth is enabled but password is missing or empty.");
       }
+      if(!this.config.database.authSource) {
+        throw Error("Database auth is enabled but authSource is missing or empty.");
+      }
     }
   }
 
diff --git a/src/services/database/database.ts b/src/services/database/database.ts
index d2a7c8d..1ae4695 100644
--- a/src/services/database/database.ts
+++ b/src/services/database/database.ts
@@ -13,7 +13,8 @@ export class DatabaseService {
     this.mongooseInstance = await mongoose.connect(`mongodb://${dbConfig.address}/${dbConfig.name}`, {
       useNewUrlParser: true,
       useUnifiedTopology: true,
-      auth
+      auth,
+      authSource: dbConfig.authSource
     });
   }