diff --git a/dlls/d3d11/async.c b/dlls/d3d11/async.c
index 22700235749..69cc00bfb81 100644
--- a/dlls/d3d11/async.c
+++ b/dlls/d3d11/async.c
@@ -386,7 +386,7 @@ static HRESULT d3d_query_init(struct d3d_query *query, struct d3d_device *device
         /* D3D11_QUERY_SO_OVERFLOW_PREDICATE    */  WINED3D_QUERY_TYPE_SO_OVERFLOW,
     };
 
-    if (desc->Query >= sizeof(query_type_map) / sizeof(*query_type_map))
+    if (desc->Query >= ARRAY_SIZE(query_type_map))
     {
         FIXME("Unhandled query type %#x.\n", desc->Query);
         return E_INVALIDARG;
diff --git a/dlls/d3d11/d3d11_main.c b/dlls/d3d11/d3d11_main.c
index ef2c40c57a0..154a376b784 100644
--- a/dlls/d3d11/d3d11_main.c
+++ b/dlls/d3d11/d3d11_main.c
@@ -118,7 +118,7 @@ HRESULT WINAPI D3D11CoreRegisterLayers(void)
         {DXGI_DEVICE_LAYER_D3D10_DEVICE, layer_init, layer_get_size, layer_create, layer_set_feature_level},
     };
 
-    DXGID3D10RegisterLayers(layers, sizeof(layers)/sizeof(*layers));
+    DXGID3D10RegisterLayers(layers, ARRAY_SIZE(layers));
 
     return S_OK;
 }
@@ -265,7 +265,7 @@ HRESULT WINAPI D3D11CreateDevice(IDXGIAdapter *adapter, D3D_DRIVER_TYPE driver_t
     if (!feature_levels)
     {
         feature_levels = default_feature_levels;
-        levels = sizeof(default_feature_levels) / sizeof(default_feature_levels[0]);
+        levels = ARRAY_SIZE(default_feature_levels);
     }
     hr = D3D11CoreCreateDevice(factory, adapter, flags, feature_levels, levels, &device);
     IDXGIAdapter_Release(adapter);