diff --git a/wgpu/src/lib.rs b/wgpu/src/lib.rs
index 22dd210650..174f7c6424 100644
--- a/wgpu/src/lib.rs
+++ b/wgpu/src/lib.rs
@@ -1025,6 +1025,9 @@ pub struct BufferReadMapping {
     buffer_id: wgc::id::BufferId,
 }
 
+unsafe impl Send for BufferReadMapping {}
+unsafe impl Sync for BufferReadMapping {}
+
 impl BufferReadMapping
 {
     pub fn as_slice(&self) -> &[u8] {
@@ -1046,6 +1049,9 @@ pub struct BufferWriteMapping {
     buffer_id: wgc::id::BufferId,
 }
 
+unsafe impl Send for BufferWriteMapping {}
+unsafe impl Sync for BufferWriteMapping {}
+
 impl BufferWriteMapping
 {
     pub fn as_slice(&mut self) -> &mut [u8] {