diff --git a/node/node-4.d.ts b/node/node-4.d.ts
index daebb4585e..f05444336d 100644
--- a/node/node-4.d.ts
+++ b/node/node-4.d.ts
@@ -430,7 +430,7 @@ declare namespace NodeJS {
 interface NodeBuffer extends Uint8Array {
     write(string: string, offset?: number, length?: number, encoding?: string): number;
     toString(encoding?: string, start?: number, end?: number): string;
-    toJSON(): any;
+    toJSON(): {type: 'Buffer', data: any[]};
     equals(otherBuffer: Buffer): boolean;
     compare(otherBuffer: Buffer): number;
     copy(targetBuffer: Buffer, targetStart?: number, sourceStart?: number, sourceEnd?: number): number;
diff --git a/node/node.d.ts b/node/node.d.ts
index a9112d47a4..8c4123f283 100644
--- a/node/node.d.ts
+++ b/node/node.d.ts
@@ -464,7 +464,7 @@ interface IterableIterator<T> {}
 interface NodeBuffer extends Uint8Array {
     write(string: string, offset?: number, length?: number, encoding?: string): number;
     toString(encoding?: string, start?: number, end?: number): string;
-    toJSON(): any;
+    toJSON(): {type: 'Buffer', data: any[]};
     equals(otherBuffer: Buffer): boolean;
     compare(otherBuffer: Buffer, targetStart?: number, targetEnd?: number, sourceStart?: number, sourceEnd?: number): number;
     copy(targetBuffer: Buffer, targetStart?: number, sourceStart?: number, sourceEnd?: number): number;