diff --git a/src/dawn/native/d3d11/DeviceD3D11.cpp b/src/dawn/native/d3d11/DeviceD3D11.cpp
index e51a26f..57480c6 100644
--- a/src/dawn/native/d3d11/DeviceD3D11.cpp
+++ b/src/dawn/native/d3d11/DeviceD3D11.cpp
@@ -449,7 +449,7 @@
 void Device::AppendDeviceLostMessage(ErrorData* error) {
     if (mD3d11Device) {
         HRESULT result = mD3d11Device->GetDeviceRemovedReason();
-        error->AppendBackendMessage("Device removed reason: %s (0x08X)",
+        error->AppendBackendMessage("Device removed reason: %s (0x%08X)",
                                     d3d::HRESULTAsString(result), result);
     }
 }
diff --git a/src/dawn/native/d3d12/DeviceD3D12.cpp b/src/dawn/native/d3d12/DeviceD3D12.cpp
index 4c16b45..61edb53 100644
--- a/src/dawn/native/d3d12/DeviceD3D12.cpp
+++ b/src/dawn/native/d3d12/DeviceD3D12.cpp
@@ -758,7 +758,7 @@
 void Device::AppendDeviceLostMessage(ErrorData* error) {
     if (mD3d12Device) {
         HRESULT result = mD3d12Device->GetDeviceRemovedReason();
-        error->AppendBackendMessage("Device removed reason: %s (0x08X)",
+        error->AppendBackendMessage("Device removed reason: %s (0x%08X)",
                                     d3d::HRESULTAsString(result), result);
     }
 }