--- src/sysc/kernel/sc_cmnhdr.h
+++ src/sysc/kernel/sc_cmnhdr.h
@@ -199,7 +199,7 @@
 // (deliberately outside of include guards to enable later effect)
 #if defined(SC_HAS_WINDOWS_H_) && defined(SC_INCLUDE_WINDOWS_H)
 #  undef SC_HAS_WINDOWS_H_
-#  include <Windows.h>
+#  include <windows.h>
 #endif
 
 // $Log: sc_cmnhdr.h,v $