diff --git a/reactos/include/msvcrt/errno.h b/reactos/include/msvcrt/errno.h
index 2d460a202ef..01d49949451 100644
--- a/reactos/include/msvcrt/errno.h
+++ b/reactos/include/msvcrt/errno.h
@@ -18,9 +18,9 @@
  *  DISCLAMED. This includes but is not limited to warranties of
  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  *
- * $Revision: 1.2 $
+ * $Revision: 1.3 $
  * $Author: ekohl $
- * $Date: 2001/07/03 12:56:48 $
+ * $Date: 2001/10/04 16:05:41 $
  *
  */
 
@@ -98,7 +98,7 @@ extern "C" {
 int*	_errno(void);
 #define	errno		(*_errno())
 
-int*	__doserrno(void);
+unsigned long*	__doserrno(void);
 #define	_doserrno	(*__doserrno())
 
 /* One of the MSVCRTxx libraries */
diff --git a/reactos/include/msvcrt/internal/tls.h b/reactos/include/msvcrt/internal/tls.h
index c46362d484d..4a6bfb2f522 100644
--- a/reactos/include/msvcrt/internal/tls.h
+++ b/reactos/include/msvcrt/internal/tls.h
@@ -7,8 +7,8 @@
 
 typedef struct _ThreadData
 {
-  int terrno;
-  unsigned long tdoserrno;
+  int terrno;			/* *nix error code */
+  unsigned long tdoserrno;	/* Win32 error code (for I/O only) */
   unsigned long long tnext;	/* used by rand/srand */
 
   char *lasttoken;		/* used by strtok */
diff --git a/reactos/lib/msvcrt/stdlib/errno.c b/reactos/lib/msvcrt/stdlib/errno.c
index 5aa3e505915..a77dba0fa7d 100644
--- a/reactos/lib/msvcrt/stdlib/errno.c
+++ b/reactos/lib/msvcrt/stdlib/errno.c
@@ -1,4 +1,4 @@
-/* $Id: errno.c,v 1.4 2001/10/03 02:15:34 ekohl Exp $
+/* $Id: errno.c,v 1.5 2001/10/04 16:06:36 ekohl Exp $
  *
  */
 
@@ -6,7 +6,7 @@
 #include <msvcrt/internal/tls.h>
 #include <msvcrt/internal/file.h>
 
-int *__doserrno(void)
+unsigned long *__doserrno(void)
 {
   return(&GetThreadData()->tdoserrno);
 }