diff --git a/cc/config/clang.go b/cc/config/clang.go
index 977afe123..64bb96ea2 100644
--- a/cc/config/clang.go
+++ b/cc/config/clang.go
@@ -66,7 +66,7 @@ var ClangUnknownCflags = sorted([]string{
 })
 
 var ClangLibToolingUnknownCflags = []string{
-	"-flto",
+	"-flto*",
 	"-fsanitize*",
 }