diff --git a/library/std/src/sync/mpmc/error.rs b/library/std/src/sync/mpmc/error.rs
index 1b8a1f38797..33b2bff8534 100644
--- a/library/std/src/sync/mpmc/error.rs
+++ b/library/std/src/sync/mpmc/error.rs
@@ -35,7 +35,7 @@ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
     }
 }
 
-impl<T: Send> error::Error for SendTimeoutError<T> {}
+impl<T> error::Error for SendTimeoutError<T> {}
 
 impl<T> From<SendError<T>> for SendTimeoutError<T> {
     fn from(err: SendError<T>) -> SendTimeoutError<T> {
diff --git a/library/std/src/sync/mpsc/mod.rs b/library/std/src/sync/mpsc/mod.rs
index 6e3c28f10bb..0e0c87d1c74 100644
--- a/library/std/src/sync/mpsc/mod.rs
+++ b/library/std/src/sync/mpsc/mod.rs
@@ -1124,7 +1124,7 @@ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
 }
 
 #[stable(feature = "rust1", since = "1.0.0")]
-impl<T: Send> error::Error for SendError<T> {
+impl<T> error::Error for SendError<T> {
     #[allow(deprecated)]
     fn description(&self) -> &str {
         "sending on a closed channel"
@@ -1152,7 +1152,7 @@ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
 }
 
 #[stable(feature = "rust1", since = "1.0.0")]
-impl<T: Send> error::Error for TrySendError<T> {
+impl<T> error::Error for TrySendError<T> {
     #[allow(deprecated)]
     fn description(&self) -> &str {
         match *self {