diff --git a/.cargo/config.toml b/.cargo/config.toml
index 68c7980..4865338 100644
--- a/.cargo/config.toml
+++ b/.cargo/config.toml
@@ -3,5 +3,5 @@ rustflags = ["--cfg=web_sys_unstable_apis"]
 
 [build]
 #just comment in the "current" target
-target = "x86_64-unknown-linux-gnu"
-#target = "wasm32-unknown-unknown"
+#target = "x86_64-unknown-linux-gnu"
+target = "wasm32-unknown-unknown"
diff --git a/src/backend/wasm.rs b/src/backend/wasm.rs
index 878a8c0..cbd5046 100644
--- a/src/backend/wasm.rs
+++ b/src/backend/wasm.rs
@@ -410,7 +410,9 @@ impl<'a> UsbInterface<'a> for Interface {
         let result: UsbOutTransferResult = match JsFuture::from(Promise::resolve(
             &self
                 .device
-                .control_transfer_out_with_buffer_source(&params, array_obj),
+                .control_transfer_out_with_buffer_source(&params, array_obj)
+                .map_err(|j| Error::CommunicationError(j.as_string().unwrap_or_default()))?
+                .into(),
         ))
         .await
         {
@@ -448,7 +450,9 @@ impl<'a> UsbInterface<'a> for Interface {
         let promise = Promise::resolve(
             &self
                 .device
-                .transfer_out_with_buffer_source(endpoint, array_obj),
+                .transfer_out_with_buffer_source(endpoint, array_obj)
+                .map_err(|j| Error::CommunicationError(j.as_string().unwrap_or_default()))?
+                .into(),
         );
 
         let result = JsFuture::from(promise).await;