diff --git a/src/libstd/sync/mutex.rs b/src/libstd/sync/mutex.rs
index e83ebd1061284..2cc29629f6a3b 100644
--- a/src/libstd/sync/mutex.rs
+++ b/src/libstd/sync/mutex.rs
@@ -311,7 +311,7 @@ impl<T: ?Sized> Drop for Mutex<T> {
 }
 
 #[stable(feature = "rust1", since = "1.0.0")]
-impl<T: ?Sized + fmt::Debug + 'static> fmt::Debug for Mutex<T> {
+impl<T: ?Sized + fmt::Debug> fmt::Debug for Mutex<T> {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         match self.try_lock() {
             Ok(guard) => write!(f, "Mutex {{ data: {:?} }}", &*guard),