diff --git a/libs/vkd3d-common/blob.c b/libs/vkd3d-common/blob.c
index 0e178d12..6c893b89 100644
--- a/libs/vkd3d-common/blob.c
+++ b/libs/vkd3d-common/blob.c
@@ -69,7 +69,7 @@ static ULONG STDMETHODCALLTYPE vkd3d_blob_AddRef(ID3DBlob *iface)
 static ULONG STDMETHODCALLTYPE vkd3d_blob_Release(ID3DBlob *iface)
 {
     struct vkd3d_blob *blob = impl_from_ID3DBlob(iface);
-    ULONG refcount = InterlockedDecrement((LONG *)&blob->refcount);
+    unsigned int refcount = vkd3d_atomic_decrement_u32(&blob->refcount);
 
     TRACE("%p decreasing refcount to %u.\n", blob, refcount);