diff --git a/types/google-protobuf/index.d.ts b/types/google-protobuf/index.d.ts
index 608d49addb2500..893bd7a85cd92a 100644
--- a/types/google-protobuf/index.d.ts
+++ b/types/google-protobuf/index.d.ts
@@ -242,6 +242,7 @@ export class BinaryReader {
   getBuffer(): Uint8Array;
   getFieldNumber(): number;
   getWireType(): BinaryConstants.WireType;
+  isDelimited(): boolean;
   isEndGroup(): boolean;
   getError(): boolean;
   setBlock(bytes?: ByteSource, start?: number, length?: number): void;