diff --git a/cc/config/clang.go b/cc/config/clang.go
index 6f08fa914..2345ebc25 100644
--- a/cc/config/clang.go
+++ b/cc/config/clang.go
@@ -100,9 +100,6 @@ func init() {
 		// http://b/68236239 Allow 0/NULL instead of using nullptr everywhere.
 		"-Wno-zero-as-null-pointer-constant",
 
-		// http://b/68236396 Allow unknown warning options.
-		"-Wno-unknown-warning-option",
-
 		// http://b/36463318 Clang executes with an absolute path, so clang-provided
 		// headers are now absolute.
 		"-fdebug-prefix-map=$$PWD/=",