diff --git a/include/wx/wxcrtbase.h b/include/wx/wxcrtbase.h
index 07828befe9..6cc5b4b60d 100644
--- a/include/wx/wxcrtbase.h
+++ b/include/wx/wxcrtbase.h
@@ -34,6 +34,9 @@
 #include <wctype.h>
 #include <time.h>
 
+#ifdef __WINDOWS__
+#include <io.h>
+#endif
 
 #if defined(HAVE_STRTOK_R) && defined(__DARWIN__) && defined(_MSL_USING_MW_C_HEADERS) && _MSL_USING_MW_C_HEADERS
     char *strtok_r(char *, const char *, char **);