diff --git a/cc/config/global.go b/cc/config/global.go
index 3fd1b10..454a4db 100644
--- a/cc/config/global.go
+++ b/cc/config/global.go
@@ -207,10 +207,7 @@
 		"-Werror=fortify-source",
 
 		"-Werror=address-of-temporary",
-		// Bug: http://b/29823425 Disable -Wnull-dereference until the
-		// new cases detected by this warning in Clang r271374 are
-		// fixed.
-		//"-Werror=null-dereference",
+		"-Werror=null-dereference",
 		"-Werror=return-type",
 
 		// http://b/72331526 Disable -Wtautological-* until the instances detected by these