diff --git a/include/nlohmann/json_fwd.hpp b/include/nlohmann/json_fwd.hpp
index 750adb64..7f003a88 100644
--- a/include/nlohmann/json_fwd.hpp
+++ b/include/nlohmann/json_fwd.hpp
@@ -21,7 +21,7 @@ This serializer ignores the template arguments and uses ADL
 ([argument-dependent lookup](http://en.cppreference.com/w/cpp/language/adl))
 for serialization.
 */
-template<typename = void, typename = void>
+template<typename T = void, typename SFINAE = void>
 struct adl_serializer;
 
 template<template<typename U, typename V, typename... Args> class ObjectType =
diff --git a/single_include/nlohmann/json.hpp b/single_include/nlohmann/json.hpp
index 8c9942bb..9e532961 100644
--- a/single_include/nlohmann/json.hpp
+++ b/single_include/nlohmann/json.hpp
@@ -70,7 +70,7 @@ This serializer ignores the template arguments and uses ADL
 ([argument-dependent lookup](http://en.cppreference.com/w/cpp/language/adl))
 for serialization.
 */
-template<typename = void, typename = void>
+template<typename T = void, typename SFINAE = void>
 struct adl_serializer;
 
 template<template<typename U, typename V, typename... Args> class ObjectType =