diff --git a/types/nightmare/index.d.ts b/types/nightmare/index.d.ts
index f3895b90c0..bb21444d88 100644
--- a/types/nightmare/index.d.ts
+++ b/types/nightmare/index.d.ts
@@ -107,7 +107,7 @@ declare class Nightmare {
     html(path: string, saveType: 'MHTML'): Nightmare;
     pdf(path: string): Nightmare;
     pdf(path: string, options: Object): Nightmare;
-    pdf(cd:(err:Error, data:Buffer)=>void): Nightmare;
+    pdf(cb: (err: Error, data: Buffer) => void): Nightmare;
     title(): string;
     title(cb: (title: string) => void): Nightmare;
     url(cb: (url: string) => void): Nightmare;
diff --git a/types/nightmare/nightmare-tests.ts b/types/nightmare/nightmare-tests.ts
index 65391e8ef9..81790dda5f 100644
--- a/types/nightmare/nightmare-tests.ts
+++ b/types/nightmare/nightmare-tests.ts
@@ -196,7 +196,6 @@ new Nightmare()
   })
   .run(done)
 
-
 new Nightmare()
   .goto('http://www.google.com/')
   .wait('input')