diff --git a/Makefile.griffin b/Makefile.griffin
index e1bc84e621..2e938dfbeb 100644
--- a/Makefile.griffin
+++ b/Makefile.griffin
@@ -509,7 +509,7 @@ else ifneq (,$(findstring windows_msvc2010,$(platform)))
 
    ifeq ($(HAVE_DIRECTX), 1)
       PLATCFLAGS += -DHAVE_DINPUT -DHAVE_DSOUND -DHAVE_D3D -DHAVE_D3D9 -DHAVE_XAUDIO -DHAVE_XINPUT
-      export DXSDK_DIR := $(DXSDK_DIR)
+      DXSDK_DIR := $(DXSDK_DIR:\=)
       export INCLUDE := $(INCLUDE);$(WindowsSdkDir)\Include;$(DXSDK_DIR)\Include;libretro-common\include;libretro-common\include\compat\msvc;gfx\include
       export LIB := $(LIB);$(WindowsSdkDir)\$(PlatLib);$(DXSDK_DIR)\Lib\$(WinArch)
    else