diff --git a/include/nlohmann/detail/output/fancy_serializer.hpp b/include/nlohmann/detail/output/fancy_serializer.hpp
index b01cfab51..190bcbc63 100644
--- a/include/nlohmann/detail/output/fancy_serializer.hpp
+++ b/include/nlohmann/detail/output/fancy_serializer.hpp
@@ -279,7 +279,7 @@ class fancy_serializer
         }
     }
 
-    void dump_string(string_t const& str, bool ensure_ascii)
+    void dump_string(const string_t& str, bool ensure_ascii)
     {
         o->write_character('\"');
         if (style.strings_maximum_length == 0)
diff --git a/single_include/nlohmann/json.hpp b/single_include/nlohmann/json.hpp
index 82589b666..8782872ea 100644
--- a/single_include/nlohmann/json.hpp
+++ b/single_include/nlohmann/json.hpp
@@ -10349,7 +10349,7 @@ class fancy_serializer
         }
     }
 
-    void dump_string(string_t const& str, bool ensure_ascii)
+    void dump_string(const string_t& str, bool ensure_ascii)
     {
         o->write_character('\"');
         if (style.strings_maximum_length == 0)