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-rw-r--r--src/libcore/time.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libcore/time.rs b/src/libcore/time.rs
index 8ebdbbd8370..807a152a2aa 100644
--- a/src/libcore/time.rs
+++ b/src/libcore/time.rs
@@ -276,7 +276,7 @@ impl Duration {
     #[unstable(feature = "duration_nanos", issue = "0")]
     #[inline]
     pub fn as_nanos(&self) -> u128 {
-        self.secs as u128 * 1000_000_000 + self.nanos as u128
+        self.secs as u128 * NANOS_PER_SEC as u128 + self.nanos as u128
     }
 
     /// Checked `Duration` addition. Computes `self + other`, returning [`None`]