diff --git a/cc/lto.go b/cc/lto.go
index 5d2fba0..b3e5e74 100644
--- a/cc/lto.go
+++ b/cc/lto.go
@@ -101,6 +101,7 @@
 		}
 
 		flags.Local.CFlags = append(flags.Local.CFlags, ltoCFlag)
+		flags.Local.AsFlags = append(flags.Local.AsFlags, ltoCFlag)
 		flags.Local.LdFlags = append(flags.Local.LdFlags, ltoCFlag)
 		flags.Local.LdFlags = append(flags.Local.LdFlags, ltoLdFlag)