diff --git a/types/bytebuffer/index.d.ts b/types/bytebuffer/index.d.ts
index bafed6edf8..eaa1a509d5 100644
--- a/types/bytebuffer/index.d.ts
+++ b/types/bytebuffer/index.d.ts
@@ -127,7 +127,7 @@ declare class ByteBuffer
      * Calculates the number of UTF8 characters of a string.JavaScript itself uses UTF- 16, so that a string's length property does not reflect its actual UTF8 size if it contains code points larger than 0xFFFF.
      */
     static calculateUTF8Chars( str: string ): number;
-    
+
     /**
      * Calculates the number of UTF8 bytes of a string. This is an alias of ByteBuffer#calculateUTF8Bytes.
      */
@@ -574,6 +574,11 @@ declare class ByteBuffer
      */
     writeInt8( value: number, offset?: number ): ByteBuffer;
 
+    /**
+     * Write a 64bit signed integer. This is an alias of ByteBuffer#writeInt64.
+     */
+     writeLong( value: number | Long, offset?: number ): ByteBuffer;
+
     /**
      * Writes a 16bit signed integer. This is an alias of ByteBuffer#writeInt16.
      */