diff --git a/harbour/source/rtl/filesys.c b/harbour/source/rtl/filesys.c
index e684b05e02..b59c614cad 100644
--- a/harbour/source/rtl/filesys.c
+++ b/harbour/source/rtl/filesys.c
@@ -412,7 +412,7 @@ BOOL    hb_fsLock   ( FHANDLE handle, ULONG start,
                       ULONG length, USHORT mode )
 {
         int result=0;
-        long pos;
+        ULONG position;
 
 #if defined(HAVE_POSIX_IO) && !defined(__GNUC__) && !defined(__IBMCPP__)
         errno = 0;
@@ -428,9 +428,9 @@ BOOL    hb_fsLock   ( FHANDLE handle, ULONG start,
         last_error = errno;
 #else
 #if defined(_MSC_VER)
-        pos = hb_fsSeek( handle, start, 0 );
+        position = hb_fsSeek( handle, start, 0 );
         result = locking( handle, mode?_LK_UNLCK:_LK_LOCK,length );
-        hb_fsSeek( handle, pos, 0 );
+        hb_fsSeek( handle, position, 0 );
 #else        
         result = 1;
         last_error = FS_ERROR;