diff --git a/cc/config/tidy.go b/cc/config/tidy.go
index 079cf25..3d1a0a0 100644
--- a/cc/config/tidy.go
+++ b/cc/config/tidy.go
@@ -22,11 +22,13 @@
 // clang-tidy doesn't recognize every flag that clang does. This is unlikely to
 // be a complete list, but we can populate this with the ones we know to avoid
 // issues with clang-diagnostic-unused-command-line-argument.
-// b/111885396: -flto affected header include directory; -fsanitize needs -flto.
+// b/111885396: -flto affected header include directory;
+// -fsanitize and -fwhole-program-vtables need -flto.
 var ClangTidyUnknownCflags = sorted([]string{
 	"-Wa,%",
 	"-flto",
 	"-fsanitize=%",
+	"-fwhole-program-vtables",
 })
 
 func init() {