diff --git a/src/secure-dfu.ts b/src/secure-dfu.ts
index cc9c7aa..a31d453 100644
--- a/src/secure-dfu.ts
+++ b/src/secure-dfu.ts
@@ -24,7 +24,6 @@
 */
 
 import { EventDispatcher } from "./dispatcher";
-import { UuidOptions } from "./uuid-options";
 
 const CONTROL_UUID = "8ec90001-f315-4f60-9fb8-838830daea50";
 const PACKET_UUID = "8ec90002-f315-4f60-9fb8-838830daea50";
@@ -119,6 +118,13 @@ export interface BluetoothLEScanFilterInit {
     namePrefix?: string;
 }
 
+export interface UuidOptions {
+    service?: number | string;
+    button?: number | string;
+    control?: number | string;
+    packet?: number | string;
+}
+
 /**
  * Secure Device Firmware Update class
  */
@@ -409,6 +415,10 @@ export class SecureDfu extends EventDispatcher {
         filters: Array<BluetoothLEScanFilterInit>,
         uuids: UuidOptions = this.DEFAULT_UUIDS
     ): Promise<BluetoothDevice> {
+        uuids = {
+            ...this.DEFAULT_UUIDS,
+            ...uuids
+        };
         if (!buttonLess && !filters) {
             filters = [ { services: [ uuids.service ] } ];
         }
@@ -436,6 +446,10 @@ export class SecureDfu extends EventDispatcher {
      * @returns Promise containing the device if it is still on a valid state
      */
     public setDfuMode(device: BluetoothDevice, uuids: UuidOptions = this.DEFAULT_UUIDS): Promise<BluetoothDevice> {
+        uuids = {
+            ...this.DEFAULT_UUIDS,
+            ...uuids
+        };
         return this.gattConnect(device, uuids.service)
         .then(characteristics => {
             this.log(`found ${characteristics.length} characteristic(s)`);
diff --git a/src/uuid-options.ts b/src/uuid-options.ts
deleted file mode 100644
index f8133a4..0000000
--- a/src/uuid-options.ts
+++ /dev/null
@@ -1,6 +0,0 @@
-export interface UuidOptions {
-    service?: number | string;
-    button?: number | string;
-    control?: number | string;
-    packet?: number | string;
-}