diff --git a/Makefile b/Makefile
index 197ff4e7..5bc38be2 100644
--- a/Makefile
+++ b/Makefile
@@ -47,4 +47,4 @@ clean:
 	go clean google.golang.org/grpc/...
 
 coverage: testdeps
-	goveralls google.golang.org/grpc/...
+	goveralls -v google.golang.org/grpc/...