diff --git a/include/ruby/backward/cxxanyargs.hpp b/include/ruby/backward/cxxanyargs.hpp
index b2491956d7..09ad976210 100644
--- a/include/ruby/backward/cxxanyargs.hpp
+++ b/include/ruby/backward/cxxanyargs.hpp
@@ -510,8 +510,8 @@ struct driver {
     template<bool b> struct specific< 2, b> : public engine< 2, VALUE(*)(VALUE, VALUE, VALUE)> {};
     template<bool b> struct specific< 1, b> : public engine< 1, VALUE(*)(VALUE, VALUE)> {};
     template<bool b> struct specific< 0, b> : public engine< 0, VALUE(*)(VALUE)> {};
-    template<bool b> struct specific<-1, b> : public engine<-1, VALUE(*)(int argc, VALUE argv, VALUE self)> {
-        using engine<-1, VALUE(*)(int argc, VALUE argv, VALUE self)>::define;
+    template<bool b> struct specific<-1, b> : public engine<-1, VALUE(*)(int argc, VALUE *argv, VALUE self)> {
+        using engine<-1, VALUE(*)(int argc, VALUE *argv, VALUE self)>::define;
         static inline void define(VALUE c, T m, VALUE(*f)(int argc, VALUE *argv, VALUE self)) { F(c, m, reinterpret_cast<type *>(f), -1); }
         static inline void define(VALUE c, T m, VALUE(*f)(int argc, const VALUE *argv, VALUE self)) { F(c, m, reinterpret_cast<type *>(f), -1); }
         static inline void define(VALUE c, T m, VALUE(*f)(int argc, const VALUE *argv, VALUE self, VALUE)) { F(c, m, reinterpret_cast<type *>(f), -1); }
@@ -556,8 +556,8 @@ struct driver0 {
     template<bool b> struct specific< 2, b> : public engine< 2, VALUE(*)(VALUE, VALUE, VALUE)> {};
     template<bool b> struct specific< 1, b> : public engine< 1, VALUE(*)(VALUE, VALUE)> {};
     template<bool b> struct specific< 0, b> : public engine< 0, VALUE(*)(VALUE)> {};
-    template<bool b> struct specific<-1, b> : public engine<-1, VALUE(*)(int argc, VALUE argv, VALUE self)> {
-        using engine<-1, VALUE(*)(int argc, VALUE argv, VALUE self)>::define;
+    template<bool b> struct specific<-1, b> : public engine<-1, VALUE(*)(int argc, VALUE *argv, VALUE self)> {
+        using engine<-1, VALUE(*)(int argc, VALUE *argv, VALUE self)>::define;
         static inline void define(T m, VALUE(*f)(int argc, VALUE *argv, VALUE self)) { F(m, reinterpret_cast<type *>(f), -1); }
         static inline void define(T m, VALUE(*f)(int argc, const VALUE *argv, VALUE self)) { F(m, reinterpret_cast<type *>(f), -1); }
         static inline void define(T m, VALUE(*f)(int argc, const VALUE *argv, VALUE self, VALUE)) { F(m, reinterpret_cast<type *>(f), -1); }