--- a/include/fmt/ranges.h	(index)
+++ b/include/fmt/ranges.h	(working tree)
@@ -487,21 +487,21 @@ auto write_range_entry(OutputIt out, basic_string_view<Char> str) -> OutputIt {
     default:
       if (is_utf8()) {
         if (escape.cp < 0x100) {
-          out = format_to(out, "\\x{:02x}", escape.cp);
+          out = fmt::format_to(out, "\\x{:02x}", escape.cp);
           continue;
         }
         if (escape.cp < 0x10000) {
-          out = format_to(out, "\\u{:04x}", escape.cp);
+          out = fmt::format_to(out, "\\u{:04x}", escape.cp);
           continue;
         }
         if (escape.cp < 0x110000) {
-          out = format_to(out, "\\U{:08x}", escape.cp);
+          out = fmt::format_to(out, "\\U{:08x}", escape.cp);
           continue;
         }
       }
       for (Char escape_char : basic_string_view<Char>(
                escape.begin, to_unsigned(escape.end - escape.begin))) {
-        out = format_to(
+        out = fmt::format_to(
             out, "\\x{:02x}",
             static_cast<typename std::make_unsigned<Char>::type>(escape_char));
       }