diff --git a/src/microsoft/vulkan/dzn_nir.h b/src/microsoft/vulkan/dzn_nir.h
index 8e095ddb040..9492764fbb1 100644
--- a/src/microsoft/vulkan/dzn_nir.h
+++ b/src/microsoft/vulkan/dzn_nir.h
@@ -26,6 +26,7 @@
 
 #define D3D12_IGNORE_SDK_LAYERS
 #define COBJMACROS
+#include <unknwn.h>
 #include <directx/d3d12.h>
 
 #include "nir.h"
diff --git a/src/microsoft/vulkan/dzn_private.h b/src/microsoft/vulkan/dzn_private.h
index 85dfa9f2130..78af26d90cb 100644
--- a/src/microsoft/vulkan/dzn_private.h
+++ b/src/microsoft/vulkan/dzn_private.h
@@ -55,6 +55,7 @@
 
 #define D3D12_IGNORE_SDK_LAYERS
 #define COBJMACROS
+#include <unknwn.h>
 #include <dxgi1_4.h>
 #include <directx/d3d12.h>