1 files changed, 10 insertions, 4 deletions
diff --git a/include/ruby/ruby.h b/include/ruby/ruby.h
index ed91594bf1..3e6909d3e0 100644
--- a/include/ruby/ruby.h
+++ b/include/ruby/ruby.h
@@ -931,16 +931,22 @@ struct RFile {
 
 struct RRational {
     struct RBasic basic;
-    VALUE num;
-    VALUE den;
+    const VALUE num;
+    const VALUE den;
 };
 
+#define RRATIONAL_SET_NUM(rat, n) (*((VALUE *)(&((struct RRational *)(rat))->num)) = (n))
+#define RRATIONAL_SET_DEN(rat, d) (*((VALUE *)(&((struct RRational *)(rat))->den)) = (d))
+
 struct RComplex {
     struct RBasic basic;
-    VALUE real;
-    VALUE imag;
+    const VALUE real;
+    const VALUE imag;
 };
 
+#define RCOMPLEX_SET_REAL(cmp, r) (*((VALUE *)(&((struct RComplex *)(cmp))->real)) = (r))
+#define RCOMPLEX_SET_IMAG(cmp, i) (*((VALUE *)(&((struct RComplex *)(cmp))->imag)) = (i))
+
 struct RData {
     struct RBasic basic;
     void (*dmark)(void*);