diff --git a/src/microsoft/vulkan/dzn_device.cpp b/src/microsoft/vulkan/dzn_device.cpp
index a5caf6571e8..20a35af8655 100644
--- a/src/microsoft/vulkan/dzn_device.cpp
+++ b/src/microsoft/vulkan/dzn_device.cpp
@@ -1795,7 +1795,7 @@ dzn_device_create_root_sig(dzn_device *device,
 {
    dzn_instance *instance =
       container_of(device->vk.physical->instance, dzn_instance, vk);
-   ID3DBlob *sig, *error;
+   ID3D10Blob *sig, *error;
 
    if (FAILED(instance->d3d12.serialize_root_sig(desc,
                                                  &sig, &error))) {