diff --git a/src/core/include/mp-units/framework/symbol_text.h b/src/core/include/mp-units/framework/symbol_text.h
index 4d6add47f..faef17bbd 100644
--- a/src/core/include/mp-units/framework/symbol_text.h
+++ b/src/core/include/mp-units/framework/symbol_text.h
@@ -66,7 +66,7 @@ constexpr bool is_basic_literal_character_set_char(char ch)
 template<std::size_t N, typename InputIt>
 constexpr bool is_basic_literal_character_set(InputIt begin, InputIt end) noexcept
 {
-  return detail::all_of(begin, end, is_basic_literal_character_set_char);
+  return all_of(begin, end, is_basic_literal_character_set_char);
 }
 
 template<std::size_t N>
@@ -78,7 +78,7 @@ constexpr bool is_basic_literal_character_set(const char (&txt)[N]) noexcept
 template<std::size_t N>
 constexpr fixed_u8string<N> to_u8string(fixed_string<N> txt)
 {
-  MP_UNITS_EXPECTS(detail::is_basic_literal_character_set(txt));
+  MP_UNITS_EXPECTS(is_basic_literal_character_set(txt));
   return std::bit_cast<fixed_u8string<N>>(txt);
 }