diff --git a/Makefile.libretro b/Makefile.libretro
index 9e92522..3960139 100644
--- a/Makefile.libretro
+++ b/Makefile.libretro
@@ -342,17 +342,18 @@ else ifneq (,$(findstring windows_msvc2017,$(platform)))
 	TargetArchMoniker = $(subst windows_msvc2017_,,$(platform))
 
 	WindowsSDKUCRTIncludeDir := $(shell cygpath -w "$(WindowsSdkDir)\Include\$(WindowsSDKVersion)\ucrt")
+	WindowsSDKUMIncludeDir := $(shell cygpath -w "$(WindowsSdkDir)\Include\$(WindowsSDKVersion)\um")
 	WindowsSDKUCRTLibDir := $(shell cygpath -w "$(WindowsSdkDir)\Lib\$(WindowsSDKVersion)\ucrt\$(TargetArchMoniker)")
 	WindowsSDKUMLibDir := $(shell cygpath -w "$(WindowsSdkDir)\Lib\$(WindowsSDKVersion)\um\$(TargetArchMoniker)")
 
 	VCCompilerToolsBinDir := $(VcCompilerToolsDir)\bin\$(HostCPUArchDir)
-	
+
 	PATH := $(shell IFS=$$'\n'; cygpath "$(VCCompilerToolsBinDir)/$(TargetArchMoniker)"):$(PATH)
 	PATH := $(PATH):$(shell IFS=$$'\n'; cygpath "$(VsInstallRoot)/Common7/IDE")
 	INCLUDE := $(shell IFS=$$'\n'; cygpath -w "$(VcCompilerToolsDir)/include")
 	LIB := $(shell IFS=$$'\n'; cygpath -w "$(VcCompilerToolsDir)/lib/$(TargetArchMoniker)")
 
-	export INCLUDE := $(INCLUDE);$(WindowsSDKUCRTIncludeDir)
+	export INCLUDE := $(INCLUDE);$(WindowsSDKUCRTIncludeDir);$(WindowsSDKUMIncludeDir)
 	export LIB := $(LIB);$(WindowsSDKUCRTLibDir);$(WindowsSDKUMLibDir)
 	TARGET := $(TARGET_NAME)_libretro.dll
 	PSS_STYLE :=2