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-rw-r--r--mrbgems/mruby-rational/src/rational.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/mrbgems/mruby-rational/src/rational.c b/mrbgems/mruby-rational/src/rational.c
index 2a3f6df09..fa061c0b8 100644
--- a/mrbgems/mruby-rational/src/rational.c
+++ b/mrbgems/mruby-rational/src/rational.c
@@ -37,6 +37,7 @@ rational_new(mrb_state *mrb, mrb_int numerator, mrb_int denominator)
struct mrb_rational *p = rational_ptr(rat);
p->numerator = numerator;
p->denominator = denominator;
+ MRB_SET_FROZEN_FLAG(s);
return rat;
}