diff --git a/dom/webgpu/ipc/WebGPUChild.cpp b/dom/webgpu/ipc/WebGPUChild.cpp
index ca9000cccaca..097c8a92cd29 100644
--- a/dom/webgpu/ipc/WebGPUChild.cpp
+++ b/dom/webgpu/ipc/WebGPUChild.cpp
@@ -425,7 +425,7 @@ RawId WebGPUChild::DeviceCreateRenderPipeline(
     if (!vertex_desc.IsNull()) {
       vb_desc = ConvertVertexBufferLayoutDescriptor(vertex_desc.Value());
     }
-    desc.mVertexState.mVertexBuffers.AppendElement(vb_desc);
+    desc.mVertexState.mVertexBuffers.AppendElement(std::move(vb_desc));
   }
   desc.mSampleCount = aDesc.mSampleCount;
   desc.mSampleMask = aDesc.mSampleMask;
diff --git a/dom/webgpu/ipc/WebGPUParent.cpp b/dom/webgpu/ipc/WebGPUParent.cpp
index cf8b63dacc62..843ff98bbc24 100644
--- a/dom/webgpu/ipc/WebGPUParent.cpp
+++ b/dom/webgpu/ipc/WebGPUParent.cpp
@@ -553,7 +553,7 @@ ipc::IPCResult WebGPUParent::RecvDeviceCreateSwapChain(
   auto textureHost = new layers::MemoryTextureHost(
       textureHostData, aDesc, layers::TextureFlags::NO_FLAGS);
   textureHost->CreateRenderTexture(aExternalId);
-  nsTArray<RawId> bufferIds(aBufferIds);
+  nsTArray<RawId> bufferIds(aBufferIds.Clone());
   RefPtr<PresentationData> data = new PresentationData();
   data->mDeviceId = aSelfId;
   data->mQueueId = aQueueId;