diff --git a/third_party/BUILD.gn b/third_party/BUILD.gn
index 7d44e2d..4d6f5bf 100644
--- a/third_party/BUILD.gn
+++ b/third_party/BUILD.gn
@@ -263,9 +263,6 @@
       # cmslut.cc is sloppy with aggregate initialization. Version 2.7 of this
       # library doesn't appear to have this problem.
       "-Wno-missing-braces",
-
-      # FindPrev() in cmsplugin.c is unused.
-      "-Wno-unused-function",
     ]
   }
 }