1 files changed, 9 insertions, 0 deletions
diff --git a/src/libstd/tuple.rs b/src/libstd/tuple.rs
index 5d9ca6202e2..2591131f215 100644
--- a/src/libstd/tuple.rs
+++ b/src/libstd/tuple.rs
@@ -89,6 +89,7 @@ macro_rules! tuple_impls {
         pub mod inner {
             use clone::Clone;
             #[cfg(not(test))] use cmp::*;
+            #[cfg(not(test))] use default::Default;
             #[cfg(not(test))] use num::Zero;
 
             $(
@@ -173,6 +174,14 @@ macro_rules! tuple_impls {
                 }
 
                 #[cfg(not(test))]
+                impl<$($T:Default),+> Default for ($($T,)+) {
+                    #[inline]
+                    fn default() -> ($($T,)+) {
+                        ($({ let x: $T = Default::default(); x},)+)
+                    }
+                }
+
+                #[cfg(not(test))]
                 impl<$($T:Zero),+> Zero for ($($T,)+) {
                     #[inline]
                     fn zero() -> ($($T,)+) {