diff --git a/racket/src/worksp/cs/Makefile b/racket/src/worksp/cs/Makefile
index 211431e217..d5176dc9d1 100644
--- a/racket/src/worksp/cs/Makefile
+++ b/racket/src/worksp/cs/Makefile
@@ -1,5 +1,5 @@
 
-INCS = /I.. /I..\..\rktio /I..\librktio /I$(SCHEME_DIR)\$(MACHINE)\boot\$(MACHINE)
+INCS = /I.. /I..\..\rktio /I..\librktio /I..\..\worksp\cs /I$(SCHEME_DIR)\$(MACHINE)\boot\$(MACHINE)
 
 RKTIO_LIB = ..\..\build\librktio.lib
 BASE_WIN32_LIBS = WS2_32.lib Shell32.lib User32.lib
diff --git a/racket/src/worksp/cs/cs_config.h b/racket/src/worksp/cs/cs_config.h
new file mode 100644
index 0000000000..0be2c115e1
--- /dev/null
+++ b/racket/src/worksp/cs/cs_config.h
@@ -0,0 +1,5 @@
+#ifdef _WIN64
+# define SIZEOF_VOID_P 8
+#else
+# define SIZEOF_VOID_P 4
+#endif