diff --git a/src/Layers/xrRenderPC_R1/xrRender_R1.vcxproj b/src/Layers/xrRenderPC_R1/xrRender_R1.vcxproj
index a47a87b4850..d145f1c494f 100644
--- a/src/Layers/xrRenderPC_R1/xrRender_R1.vcxproj
+++ b/src/Layers/xrRenderPC_R1/xrRender_R1.vcxproj
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-      <PreprocessorDefinitions>_USRDLL;XRRENDER_R1_EXPORTS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>_USRDLL;XRRENDER_R1_EXPORTS;USE_DX9;%(PreprocessorDefinitions)</PreprocessorDefinitions>
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diff --git a/src/Layers/xrRenderPC_R2/xrRender_R2.vcxproj b/src/Layers/xrRenderPC_R2/xrRender_R2.vcxproj
index ac05faee057..afdbd15d087 100644
--- a/src/Layers/xrRenderPC_R2/xrRender_R2.vcxproj
+++ b/src/Layers/xrRenderPC_R2/xrRender_R2.vcxproj
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-      <PreprocessorDefinitions>_USRDLL;XRRENDER_R2_EXPORTS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>_USRDLL;XRRENDER_R2_EXPORTS;USE_DX9;%(PreprocessorDefinitions)</PreprocessorDefinitions>
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-      <PreprocessorDefinitions>_USRDLL;XRRENDER_R2_EXPORTS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
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-      <PreprocessorDefinitions>_USRDLL;XRRENDER_R2_EXPORTS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
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+      <PreprocessorDefinitions>_USRDLL;XRRENDER_R2_EXPORTS;USE_DX9;%(PreprocessorDefinitions)</PreprocessorDefinitions>
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