diff --git a/spanner/internal/benchwrapper/README.md b/spanner/internal/benchwrapper/README.md
index af3ac027fd56..ad0e3ea10b71 100644
--- a/spanner/internal/benchwrapper/README.md
+++ b/spanner/internal/benchwrapper/README.md
@@ -7,6 +7,6 @@ benchmarking code to prod at spanner without speaking Go.
 
 ```
 cd spanner/internal/benchwrapper
-export SPANNER_EMULATOR_HOST=localhost:8080
+export SPANNER_EMULATOR_HOST=localhost:9010
 go run *.go --port=8081
 ```