diff --git a/src/eval.c b/src/eval.c
index d238dc2..83e2016 100644
--- a/src/eval.c
+++ b/src/eval.c
@@ -23554,6 +23554,27 @@
 		return -1;
 	}
 
+#ifdef WIN3264
+# if _WIN32_WINNT >= 0x0500
+	if (vim_strchr(*fnamep, '~') != NULL)
+	{
+	    /* Expand 8.3 filename to full path.  Needed to make sure the same
+	     * file does not have two different names.
+	     * Note: problem does not occur if _WIN32_WINNT < 0x0500. */
+	    p = alloc(_MAX_PATH + 1);
+	    if (p != NULL)
+	    {
+		if (GetLongPathName(*fnamep, p, MAXPATHL))
+		{
+		    vim_free(*bufp);
+		    *bufp = *fnamep = p;
+		}
+		else
+		    vim_free(p);
+	    }
+	}
+# endif
+#endif
 	/* Append a path separator to a directory. */
 	if (mch_isdir(*fnamep))
 	{