diff --git a/source/compiler/sc2.c b/source/compiler/sc2.c
index afd95f0..e739669 100644
--- a/source/compiler/sc2.c
+++ b/source/compiler/sc2.c
@@ -27,9 +27,6 @@
 #include <ctype.h>
 #include <math.h>
 #include <sys/stat.h>
-#if defined __WIN32__ || defined _WIN32 || defined _Windows
-  #define S_ISDIR(m) (((m) & _S_IFDIR) == _S_IFDIR)
-#endif
 #include "lstring.h"
 #include "sc.h"
 #if defined LINUX || defined __FreeBSD__ || defined __OpenBSD__
@@ -40,6 +37,12 @@
   #include <alloc/fortify.h>
 #endif
 
+#if defined __WIN32__ || defined _WIN32 || defined _Windows
+  #if !defined S_ISDIR
+    #define S_ISDIR(m) (((m) & _S_IFDIR) == _S_IFDIR)
+  #endif
+#endif
+
 /* flags for litchar() */
 #define RAWMODE         1
 #define UTF8MODE        2