diff --git a/libcxx/include/string b/libcxx/include/string
--- a/libcxx/include/string
+++ b/libcxx/include/string
@@ -2285,7 +2285,7 @@
       __assign_maybe_alias(__s, __n);
     }
   } else {
-    __assign_maybe_alias(__s);
+    __assign_maybe_alias(__s, __n);
   }
   return *this;
 }