diff --git a/types/bunyan-format/bunyan-format-tests.ts b/types/bunyan-format/bunyan-format-tests.ts
index 3f4c2a658d..159c3cde17 100644
--- a/types/bunyan-format/bunyan-format-tests.ts
+++ b/types/bunyan-format/bunyan-format-tests.ts
@@ -3,3 +3,7 @@ import BunyanFormatWritable = require('bunyan-format');
 const formatOut = new BunyanFormatWritable({ outputMode: 'short' });
 
 const formatOut2 = new BunyanFormatWritable({ outputMode: 'bunyan', levelInString: true });
+
+const formatOut3 = BunyanFormatWritable({ outputMode: 'short' });
+
+const formatOut4 = BunyanFormatWritable({ outputMode: 'bunyan', levelInString: true });
diff --git a/types/bunyan-format/index.d.ts b/types/bunyan-format/index.d.ts
index 06a37ba2e5..867e724785 100644
--- a/types/bunyan-format/index.d.ts
+++ b/types/bunyan-format/index.d.ts
@@ -1,8 +1,9 @@
 // Type definitions for bunyan-format 0.2
 // Project: https://github.com/thlorenz/bunyan-format
 // Definitions by: Piotr Roszatycki <https://github.com/dex4er>
+//                 Ashley Abbott <https://github.com/ashpabb>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
-// TypeScript Version: 2.1
+// TypeScript Version: 3.6
 
 /// <reference types="node" />
 
@@ -27,4 +28,6 @@ declare class BunyanFormatWritable extends Writable {
     constructor(options: BunyanFormatWritable.Options, output?: Writable);
 }
 
+declare function BunyanFormatWritable(options: BunyanFormatWritable.Options, output?: Writable): BunyanFormatWritable;
+
 export = BunyanFormatWritable;