diff --git a/src/generate-grpc-js.ts b/src/generate-grpc-js.ts
index 5acc0a4d8..d702b1843 100644
--- a/src/generate-grpc-js.ts
+++ b/src/generate-grpc-js.ts
@@ -6,22 +6,22 @@ import { messageToTypeName } from "./types";
 import { assertInstanceOf, FormattedMethodDescriptor, maybeAddComment, maybePrefixPackage } from "./utils";
 import { generateDecoder, generateEncoder } from "./encode";
 
-const CallOptions = imp("CallOptions@@grpc/grpc-js");
+const CallOptions = imp("t:CallOptions@@grpc/grpc-js");
 const ChannelCredentials = imp("ChannelCredentials@@grpc/grpc-js");
-const ClientOptions = imp("ClientOptions@@grpc/grpc-js");
+const ClientOptions = imp("t:ClientOptions@@grpc/grpc-js");
 const Client = imp("Client@@grpc/grpc-js");
 const ClientDuplexStream = imp("ClientDuplexStream@@grpc/grpc-js");
 const ClientReadableStream = imp("ClientReadableStream@@grpc/grpc-js");
-const ClientUnaryCall = imp("ClientUnaryCall@@grpc/grpc-js");
+const ClientUnaryCall = imp("t:ClientUnaryCall@@grpc/grpc-js");
 const ClientWritableStream = imp("ClientWritableStream@@grpc/grpc-js");
 const handleBidiStreamingCall = imp("handleBidiStreamingCall@@grpc/grpc-js");
 const handleClientStreamingCall = imp("handleClientStreamingCall@@grpc/grpc-js");
 const handleServerStreamingCall = imp("handleServerStreamingCall@@grpc/grpc-js");
-const handleUnaryCall = imp("handleUnaryCall@@grpc/grpc-js");
-const UntypedServiceImplementation = imp("UntypedServiceImplementation@@grpc/grpc-js");
+const handleUnaryCall = imp("t:handleUnaryCall@@grpc/grpc-js");
+const UntypedServiceImplementation = imp("t:UntypedServiceImplementation@@grpc/grpc-js");
 const makeGenericClientConstructor = imp("makeGenericClientConstructor@@grpc/grpc-js");
 const Metadata = imp("Metadata@@grpc/grpc-js");
-const ServiceError = imp("ServiceError@@grpc/grpc-js");
+const ServiceError = imp("t:ServiceError@@grpc/grpc-js");
 
 /**
  * Generates a service definition and server / client stubs for the