1 files changed, 8 insertions, 0 deletions
diff --git a/internal.h b/internal.h
index 9b5fb0d0bb..7cd04756cc 100644
--- a/internal.h
+++ b/internal.h
@@ -404,6 +404,14 @@ struct RBignum {
 
 #define RBIGNUM(obj) (R_CAST(RBignum)(obj))
 
+struct RRational {
+    struct RBasic basic;
+    const VALUE num;
+    const VALUE den;
+};
+
+#define RRATIONAL(obj) (R_CAST(RRational)(obj))
+
 /* class.c */
 void rb_class_subclass_add(VALUE super, VALUE klass);
 void rb_class_remove_from_super_subclasses(VALUE);