diff --git a/src/response.ts b/src/response.ts
index f927876..6e75242 100644
--- a/src/response.ts
+++ b/src/response.ts
@@ -174,6 +174,18 @@ export class Response extends EventEmitter {
     return this
   }
 
+  /**
+   * Set response header. Added for compatibility with services that access the
+   * setHeader method.
+   *
+   * @param key Header key
+   * @param value Header value
+   */
+  setHeader(key: string, value: string) {
+    this.expresslessResHeaders[key.toLowerCase()] = value
+    return this
+  }
+
   /**
    * Set cookie
    */