diff --git a/cc/pgo.go b/cc/pgo.go
index ccddece..f9c8bbf 100644
--- a/cc/pgo.go
+++ b/cc/pgo.go
@@ -24,7 +24,7 @@
 var (
 	// Add flags to ignore warnings that profiles are old or missing for
 	// some functions
-	profileUseOtherFlags = []string{}
+	profileUseOtherFlags = []string{"-Wno-backend-plugin"}
 )
 
 const pgoProfileProject = "toolchain/pgo-profiles"