diff --git a/libs/vkd3d/command.c b/libs/vkd3d/command.c
index 840bc1a8..b5a46a1d 100644
--- a/libs/vkd3d/command.c
+++ b/libs/vkd3d/command.c
@@ -7442,7 +7442,7 @@ static HRESULT STDMETHODCALLTYPE d3d12_command_signature_QueryInterface(ID3D12Co
 static ULONG STDMETHODCALLTYPE d3d12_command_signature_AddRef(ID3D12CommandSignature *iface)
 {
     struct d3d12_command_signature *signature = impl_from_ID3D12CommandSignature(iface);
-    ULONG refcount = InterlockedIncrement(&signature->refcount);
+    unsigned int refcount = vkd3d_atomic_increment_u32(&signature->refcount);
 
     TRACE("%p increasing refcount to %u.\n", signature, refcount);
 
@@ -7452,7 +7452,7 @@ static ULONG STDMETHODCALLTYPE d3d12_command_signature_AddRef(ID3D12CommandSigna
 static ULONG STDMETHODCALLTYPE d3d12_command_signature_Release(ID3D12CommandSignature *iface)
 {
     struct d3d12_command_signature *signature = impl_from_ID3D12CommandSignature(iface);
-    ULONG refcount = InterlockedDecrement(&signature->refcount);
+    unsigned int refcount = InterlockedDecrement((LONG *)&signature->refcount);
 
     TRACE("%p decreasing refcount to %u.\n", signature, refcount);
 
diff --git a/libs/vkd3d/vkd3d_private.h b/libs/vkd3d/vkd3d_private.h
index a6e8c0a7..64a01c41 100644
--- a/libs/vkd3d/vkd3d_private.h
+++ b/libs/vkd3d/vkd3d_private.h
@@ -1657,7 +1657,7 @@ HRESULT d3d12_command_queue_create(struct d3d12_device *device,
 struct d3d12_command_signature
 {
     ID3D12CommandSignature ID3D12CommandSignature_iface;
-    LONG refcount;
+    unsigned int refcount;
     unsigned int internal_refcount;
 
     D3D12_COMMAND_SIGNATURE_DESC desc;