diff --git a/ext/fiddle/pointer.c b/ext/fiddle/pointer.c
index 87abc864..e0e43210 100644
--- a/ext/fiddle/pointer.c
+++ b/ext/fiddle/pointer.c
@@ -137,10 +137,12 @@ fiddle_ptr_memory_view_available_p(VALUE obj)
 static bool
 fiddle_ptr_get_memory_view(VALUE obj, rb_memory_view_t *view, int flags)
 {
-    if (flags != RUBY_MEMORY_VIEW_SIMPLE) return false;
+    bool flags_supported = (flags == RUBY_MEMORY_VIEW_SIMPLE) || (flags == RUBY_MEMORY_VIEW_WRITABLE);
+    bool read_only = !(flags & RUBY_MEMORY_VIEW_WRITABLE);
+    if (!flags_supported) return false;
 
     struct ptr_data *data = fiddle_ptr_check_memory_view(obj);
-    rb_memory_view_init_as_byte_array(view, obj, data->ptr, data->size, true);
+    rb_memory_view_init_as_byte_array(view, obj, data->ptr, data->size, read_only);
 
     return true;
 }
diff --git a/test/fiddle/test_memory_view.rb b/test/fiddle/test_memory_view.rb
index fa2e6840..da41c71b 100644
--- a/test/fiddle/test_memory_view.rb
+++ b/test/fiddle/test_memory_view.rb
@@ -38,9 +38,21 @@ def test_available?
 
     def test_new_with_flags
       ptr = Pointer["hello world"]
+
       mview = MemoryView.new(ptr, MemoryView::SIMPLE)
       begin
-        assert_equal(ptr.size, mview.byte_size)
+        assert do
+          mview.readonly?
+        end
+      ensure
+        mview.release
+      end
+
+      mview = MemoryView.new(ptr, MemoryView::WRITABLE)
+      begin
+        assert do
+          !mview.readonly?
+        end
       ensure
         mview.release
       end
@@ -49,7 +61,10 @@ def test_new_with_flags
     def test_new_with_unsupported_flags
       ptr = Pointer["hello world"]
       assert_raise(ArgumentError) do
-        MemoryView.new(ptr, MemoryView::WRITABLE)
+        MemoryView.new(ptr, MemoryView::INDIRECT)
+      end
+      assert_raise(ArgumentError) do
+        MemoryView.new(ptr, MemoryView::WRITABLE | MemoryView::INDIRECT)
       end
     end