ext/stack_frames/buffer.c in stack_frames-0.1.2 vs ext/stack_frames/buffer.c in stack_frames-0.1.3

@@ -31,10 +31,10 @@
 static size_t buffer_memsize(const void *ptr)
 {
     return sizeof(buffer_t);
 }
 
-const rb_data_type_t buffer_data_type = {
+static const rb_data_type_t buffer_data_type = {
     "stack_frames_buffer",
     { buffer_mark, buffer_free, buffer_memsize, },
     NULL, NULL, RUBY_TYPED_FREE_IMMEDIATELY
 };