diff --git a/xous-rs/src/definitions/messages/envelope.rs b/xous-rs/src/definitions/messages/envelope.rs
index 61c3eb3cc..cc9ba3fcf 100644
--- a/xous-rs/src/definitions/messages/envelope.rs
+++ b/xous-rs/src/definitions/messages/envelope.rs
@@ -7,6 +7,7 @@ pub struct Envelope {
     pub sender: MessageSender,
     pub body: Message,
 }
+unsafe impl Send for Envelope {}
 
 impl Envelope {
     pub fn to_usize(&self) -> [usize; 7] {
diff --git a/xous-rs/src/definitions/messages/mod.rs b/xous-rs/src/definitions/messages/mod.rs
index 714b7549c..5b93bf45a 100644
--- a/xous-rs/src/definitions/messages/mod.rs
+++ b/xous-rs/src/definitions/messages/mod.rs
@@ -132,6 +132,7 @@ pub enum Message {
     Scalar(ScalarMessage),
     BlockingScalar(ScalarMessage),
 }
+unsafe impl Send for Message {}
 
 impl Message {
     pub fn new_scalar(