diff --git a/interop/grpclb_fallback/client.go b/interop/grpclb_fallback/client.go
index 70f9b3d3a450..9907b1702069 100644
--- a/interop/grpclb_fallback/client.go
+++ b/interop/grpclb_fallback/client.go
@@ -1,5 +1,4 @@
-// +build !appengine
-// +build !darwin
+// +build linux
 // +build go1.11
 
 /*