diff --git a/include/private/vkd3d_common.h b/include/private/vkd3d_common.h
index ffdc83d3..abd14c74 100644
--- a/include/private/vkd3d_common.h
+++ b/include/private/vkd3d_common.h
@@ -38,7 +38,7 @@
 
 #ifndef _WIN32
 # if HAVE_SYNC_ADD_AND_FETCH
-static inline ULONG InterlockedIncrement(ULONG volatile *x)
+static inline LONG InterlockedIncrement(LONG volatile *x)
 {
     return __sync_add_and_fetch(x, 1);
 }
@@ -47,7 +47,7 @@ static inline ULONG InterlockedIncrement(ULONG volatile *x)
 # endif  /* HAVE_SYNC_ADD_AND_FETCH */
 
 # if HAVE_SYNC_SUB_AND_FETCH
-static inline ULONG InterlockedDecrement(ULONG volatile *x)
+static inline LONG InterlockedDecrement(LONG volatile *x)
 {
     return __sync_sub_and_fetch(x, 1);
 }
diff --git a/libs/vkd3d-common/debug.c b/libs/vkd3d-common/debug.c
index dab0714e..f09f0de0 100644
--- a/libs/vkd3d-common/debug.c
+++ b/libs/vkd3d-common/debug.c
@@ -84,8 +84,8 @@ void vkd3d_dbg_printf(enum vkd3d_dbg_level level, const char *function, const ch
 static char *get_buffer(void)
 {
     static char buffers[64][VKD3D_DEBUG_BUFFER_SIZE];
-    static ULONG buffer_index;
-    ULONG current_index;
+    static LONG buffer_index;
+    LONG current_index;
 
     current_index = InterlockedIncrement(&buffer_index) % ARRAY_SIZE(buffers);
     return buffers[current_index];
diff --git a/libs/vkd3d/vkd3d_private.h b/libs/vkd3d/vkd3d_private.h
index c66843b4..1f91a03b 100644
--- a/libs/vkd3d/vkd3d_private.h
+++ b/libs/vkd3d/vkd3d_private.h
@@ -74,7 +74,7 @@ HRESULT vkd3d_stop_fence_worker(struct vkd3d_fence_worker *worker) DECLSPEC_HIDD
 struct d3d12_fence
 {
     ID3D12Fence ID3D12Fence_iface;
-    ULONG refcount;
+    LONG refcount;
 
     UINT64 value;
     pthread_mutex_t mutex;
@@ -97,7 +97,7 @@ HRESULT d3d12_fence_create(struct d3d12_device *device,
 struct d3d12_resource
 {
     ID3D12Resource ID3D12Resource_iface;
-    ULONG refcount;
+    LONG refcount;
 
     D3D12_RESOURCE_DESC desc;
 
@@ -152,7 +152,7 @@ struct d3d12_dsv_desc
 struct d3d12_descriptor_heap
 {
     ID3D12DescriptorHeap ID3D12DescriptorHeap_iface;
-    ULONG refcount;
+    LONG refcount;
 
     D3D12_DESCRIPTOR_HEAP_DESC desc;
 
@@ -168,7 +168,7 @@ HRESULT d3d12_descriptor_heap_create(struct d3d12_device *device,
 struct d3d12_root_signature
 {
     ID3D12RootSignature ID3D12RootSignature_iface;
-    ULONG refcount;
+    LONG refcount;
 
     VkPipelineLayout vk_pipeline_layout;
 
@@ -182,7 +182,7 @@ HRESULT d3d12_root_signature_create(struct d3d12_device *device,
 struct d3d12_pipeline_state
 {
     ID3D12PipelineState ID3D12PipelineState_iface;
-    ULONG refcount;
+    LONG refcount;
 
     VkPipeline vk_pipeline;
 
@@ -196,7 +196,7 @@ HRESULT d3d12_pipeline_state_create_compute(struct d3d12_device *device,
 struct d3d12_command_allocator
 {
     ID3D12CommandAllocator ID3D12CommandAllocator_iface;
-    ULONG refcount;
+    LONG refcount;
 
     D3D12_COMMAND_LIST_TYPE type;
 
@@ -213,7 +213,7 @@ HRESULT d3d12_command_allocator_create(struct d3d12_device *device,
 struct d3d12_command_list
 {
     ID3D12GraphicsCommandList ID3D12GraphicsCommandList_iface;
-    ULONG refcount;
+    LONG refcount;
 
     D3D12_COMMAND_LIST_TYPE type;
     ID3D12PipelineState *pipeline_state;
@@ -241,7 +241,7 @@ HRESULT d3d12_command_list_create(struct d3d12_device *device,
 struct d3d12_command_queue
 {
     ID3D12CommandQueue ID3D12CommandQueue_iface;
-    ULONG refcount;
+    LONG refcount;
 
     D3D12_COMMAND_QUEUE_DESC desc;
 
@@ -257,7 +257,7 @@ HRESULT d3d12_command_queue_create(struct d3d12_device *device,
 struct d3d12_device
 {
     ID3D12Device ID3D12Device_iface;
-    ULONG refcount;
+    LONG refcount;
 
     VkDevice vk_device;
     struct vkd3d_vk_device_procs vk_procs;