diff --git a/types/webmidi/index.d.ts b/types/webmidi/index.d.ts
index b1f3cb0f61..0d64baaaa7 100644
--- a/types/webmidi/index.d.ts
+++ b/types/webmidi/index.d.ts
@@ -145,7 +145,7 @@ declare namespace WebMidi {
      * to zero (or another time in the past), the data is to be sent as soon as
      * possible.
      */
-    send(data: number[], timestamp?: number): void;
+    send(data: number[] | Uint8Array, timestamp?: number): void;
 
     /**
      * Clears any pending send data that has not yet been sent from the MIDIOutput 's
diff --git a/types/webmidi/webmidi-tests.ts b/types/webmidi/webmidi-tests.ts
index da4dca38c2..99335204fa 100644
--- a/types/webmidi/webmidi-tests.ts
+++ b/types/webmidi/webmidi-tests.ts
@@ -20,6 +20,7 @@ const onFulfilled = (item: WebMidi.MIDIAccess) => {
     for (const op of outputs) {
         this._outputs.push(op);
         op.send([ 0x90, 0x45, 0x7f ]);
+        op.send(new Uint8Array([ 0x90, 0x45, 0x7f ]));
     }
 
     for (const input of this._inputs) {