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-rw-r--r--src/numeric.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/numeric.c b/src/numeric.c
index 8bf2b3382..f6894a57b 100644
--- a/src/numeric.c
+++ b/src/numeric.c
@@ -1160,7 +1160,7 @@ fix_minus(mrb_state *mrb, mrb_value self)
mrb_value
mrb_fix2str(mrb_state *mrb, mrb_value x, int base)
{
- char buf[64], *b = buf + sizeof buf;
+ char buf[sizeof(mrb_int)*CHAR_BIT+2], *b = buf + sizeof buf;
mrb_int val = mrb_fixnum(x);
int neg = 0;