diff --git a/benchmark/benchmark.go b/benchmark/benchmark.go
index f7b80633..0e46b56d 100644
--- a/benchmark/benchmark.go
+++ b/benchmark/benchmark.go
@@ -129,10 +129,10 @@ func DoStreamingRoundTrip(tc testpb.TestServiceClient, stream testpb.TestService
 		Payload:      pl,
 	}
 	if err := stream.Send(req); err != nil {
-		grpclog.Fatalf("%v.StreamingCall(_) = _, %v: ", tc, err)
+		grpclog.Fatalf("%v.StreamingCall(_) = _, %v", tc, err)
 	}
 	if _, err := stream.Recv(); err != nil {
-		grpclog.Fatal("%v.StreamingCall(_) = _, %v: ", tc, err)
+		grpclog.Fatal("%v.StreamingCall(_) = _, %v", tc, err)
 	}
 }
 
diff --git a/benchmark/benchmark_test.go b/benchmark/benchmark_test.go
index f5bc32f4..f6b0c200 100644
--- a/benchmark/benchmark_test.go
+++ b/benchmark/benchmark_test.go
@@ -64,7 +64,7 @@ func runStream(b *testing.B, maxConcurrentCalls int) {
 	tc := testpb.NewTestServiceClient(conn)
 	stream, err := tc.StreamingCall(context.Background())
 	if err != nil {
-		grpclog.Fatalf("%v.StreamingCall(_) = _,%v: ", tc, err)
+		grpclog.Fatalf("%v.StreamingCall(_) = _, %v", tc, err)
 	}
 	// Warm up connection.
 	for i := 0; i < 10; i++ {
diff --git a/benchmark/client/main.go b/benchmark/client/main.go
index 55ffea19..07744af4 100644
--- a/benchmark/client/main.go
+++ b/benchmark/client/main.go
@@ -94,7 +94,7 @@ func closeLoopStream() {
 	s, conn, tc := buildConnection()
 	stream, err := tc.StreamingCall(context.Background())
 	if err != nil {
-		grpclog.Fatalf("%v.StreamingCall(_) = _,%v: ", tc, err)
+		grpclog.Fatalf("%v.StreamingCall(_) = _, %v", tc, err)
 	}
 	for i := 0; i < 100; i++ {
 		streamCaller(tc, stream)