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-rw-r--r--src/enum.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/enum.c b/src/enum.c
index 03508953e..38f004f51 100644
--- a/src/enum.c
+++ b/src/enum.c
@@ -30,7 +30,7 @@ enum_update_hash(mrb_state *mrb, mrb_value self)
/* not reached */
hv = 0;
}
- hash ^= (hv << (index % 16));
+ hash ^= ((uint32_t)hv << (index % 16));
return mrb_fixnum_value(hash);
}