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-rw-r--r--include/ruby/ruby.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/ruby/ruby.h b/include/ruby/ruby.h
index 01ab9e55cd..9cf0b4c6b0 100644
--- a/include/ruby/ruby.h
+++ b/include/ruby/ruby.h
@@ -1183,7 +1183,7 @@ void *rb_check_typeddata(VALUE, const rb_data_type_t *);
#define TypedData_Get_Struct(obj,type,data_type,sval) \
((sval) = (type*)rb_check_typeddata((obj), (data_type)))
-#define RSTRUCT_LEN(st) rb_struct_size(st)
+#define RSTRUCT_LEN(st) NUM2LONG(rb_struct_size(st))
#define RSTRUCT_PTR(st) rb_struct_ptr(st)
#define RSTRUCT_SET(st, idx, v) rb_struct_aset(st, INT2NUM(idx), (v))
#define RSTRUCT_GET(st, idx) rb_struct_aref(st, INT2NUM(idx))