diff --git a/ext/fiddle/extconf.rb b/ext/fiddle/extconf.rb
index 6ca685317e..8cc98fb8f6 100644
--- a/ext/fiddle/extconf.rb
+++ b/ext/fiddle/extconf.rb
@@ -222,10 +222,6 @@ types.each do |type, signed|
   end
 end
 
-if have_header("ruby/memory_view.h")
-  have_type("rb_memory_view_t", ["ruby/memory_view.h"])
-end
-
 if libffi
   $LOCAL_LIBS.prepend("./#{libffi.a} ").strip! # to exts.mk
   $INCFLAGS.gsub!(/-I#{libffi.dir}/, '-I$(LIBFFI_DIR)')
diff --git a/ext/fiddle/fiddle.h b/ext/fiddle/fiddle.h
index dbad910d07..c5d7fa8016 100644
--- a/ext/fiddle/fiddle.h
+++ b/ext/fiddle/fiddle.h
@@ -2,6 +2,7 @@
 #define FIDDLE_H
 
 #include <ruby.h>
+#include <ruby/version.h>
 #include <errno.h>
 
 #if defined(_WIN32)
@@ -189,7 +190,7 @@
 #define ALIGN_INT32_T ALIGN_OF(int32_t)
 #define ALIGN_INT64_T ALIGN_OF(int64_t)
 
-#ifdef HAVE_TYPE_RB_MEMORY_VIEW_T
+#if RUBY_API_VERSION_MAJOR >= 3
 # define FIDDLE_MEMORY_VIEW
 #endif
 
diff --git a/ext/fiddle/memory_view.c b/ext/fiddle/memory_view.c
index 3e260f94f9..c9df5fd2bd 100644
--- a/ext/fiddle/memory_view.c
+++ b/ext/fiddle/memory_view.c
@@ -1,10 +1,11 @@
+#include <fiddle.h>
+
+#ifdef FIDDLE_MEMORY_VIEW
+
 #include <stdbool.h>
 #include <ruby/ruby.h>
 #include <ruby/encoding.h>
-
-#ifdef HAVE_RUBY_MEMORY_VIEW_H
-# include <ruby/memory_view.h>
-#endif
+#include <ruby/memory_view.h>
 
 #if SIZEOF_INTPTR_T == SIZEOF_LONG_LONG
 #   define INTPTR2NUM LL2NUM
@@ -17,9 +18,6 @@
 #   define UINTPTR2NUM UINT2NUM
 #endif
 
-#include <fiddle.h>
-
-#ifdef FIDDLE_MEMORY_VIEW
 VALUE rb_cMemoryView = Qnil;
 
 struct memview_data {
diff --git a/ext/fiddle/pointer.c b/ext/fiddle/pointer.c
index 9336f0431c..ae9eb166ec 100644
--- a/ext/fiddle/pointer.c
+++ b/ext/fiddle/pointer.c
@@ -6,13 +6,13 @@
 #include <ruby/ruby.h>
 #include <ruby/io.h>
 
-#ifdef HAVE_RUBY_MEMORY_VIEW_H
-# include <ruby/memory_view.h>
-#endif
-
 #include <ctype.h>
 #include <fiddle.h>
 
+#ifdef FIDDLE_MEMORY_VIEW
+# include <ruby/memory_view.h>
+#endif
+
 #ifdef PRIsVALUE
 # define RB_OBJ_CLASSNAME(obj) rb_obj_class(obj)
 # define RB_OBJ_STRING(obj) (obj)