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-rw-r--r--ext/socket/ancdata.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/ext/socket/ancdata.c b/ext/socket/ancdata.c
index b58e03c712..045b68e9bc 100644
--- a/ext/socket/ancdata.c
+++ b/ext/socket/ancdata.c
@@ -333,7 +333,7 @@ ancillary_timestamp(VALUE self)
struct bintime bt;
VALUE d, timev;
memcpy((char*)&bt, RSTRING_PTR(data), sizeof(bt));
- d = ULL2NUM(0x100000000UL);
+ d = ULL2NUM(0x100000000ULL);
d = mul(d,d);
timev = add(TIMET2NUM(bt.sec), quo(ULL2NUM(bt.frac), d));
result = rb_time_num_new(timev, Qnil);