diff --git a/zipkin.proto b/zipkin.proto
index 18d2b8f..db60018 100644
--- a/zipkin.proto
+++ b/zipkin.proto
@@ -14,8 +14,6 @@
 
 syntax = "proto3";
 
-import "google/protobuf/empty.proto";
-
 package zipkin.proto3;
 
 // In Java, the closest model type to this proto is in the "zipkin2" package
@@ -215,6 +213,11 @@ message ListOfSpans {
   repeated Span spans = 1;
 }
 
+// Response for SpanService/Report RPC. This response currently does not return
+// any information beyond indicating that the request has finished. That said,
+// it may be extended in the future.
+message ReportResponse {
+}
 
 // SpanService allows reporting spans using gRPC, as opposed to HTTP POST 
 // reporting. Implementations are asynchronous and may drop spans for reasons 
@@ -226,5 +229,5 @@ service SpanService {
   // Report the provided spans to the collector. Analogous to the HTTP POST 
   // /api/v2/spans endpoint. Spans are not required to be complete or belonging 
   // to the same trace.
-  rpc Report(zipkin.proto3.ListOfSpans) returns (google.protobuf.Empty) {}
+  rpc Report(ListOfSpans) returns (ReportResponse) {}
 }