diff --git a/libcxx/include/vector b/libcxx/include/vector
--- a/libcxx/include/vector
+++ b/libcxx/include/vector
@@ -3304,10 +3304,10 @@
 }
 
 template <>
-inline constexpr bool __format::__enable_insertable<std::vector<char>> = true;
+inline constexpr bool __format::__enable_insertable<vector<char>> = true;
 #ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
 template <>
-inline constexpr bool __format::__enable_insertable<std::vector<wchar_t>> = true;
+inline constexpr bool __format::__enable_insertable<vector<wchar_t>> = true;
 #endif
 
 #endif // _LIBCPP_STD_VER > 17