diff --git a/include/nlohmann/detail/input/input_adapters.hpp b/include/nlohmann/detail/input/input_adapters.hpp
index 0f8d5c3c9..4ac750e8e 100644
--- a/include/nlohmann/detail/input/input_adapters.hpp
+++ b/include/nlohmann/detail/input/input_adapters.hpp
@@ -150,6 +150,11 @@ struct char_traits<unsigned char> : std::char_traits<char>
     {
         return static_cast<int_type>(c);
     }
+
+    static int_type eof()
+    {
+        return static_cast<int_type>(EOF);
+    }
 };
 
 // Explicitly define char traits for signed char since it is not standard
diff --git a/single_include/nlohmann/json.hpp b/single_include/nlohmann/json.hpp
index 3b2765656..2e667b40a 100644
--- a/single_include/nlohmann/json.hpp
+++ b/single_include/nlohmann/json.hpp
@@ -6233,6 +6233,11 @@ struct char_traits<unsigned char> : std::char_traits<char>
     {
         return static_cast<int_type>(c);
     }
+
+    static int_type eof()
+    {
+        return static_cast<int_type>(EOF);
+    }
 };
 
 // Explicitly define char traits for signed char since it is not standard