diff --git a/src/fileio.c b/src/fileio.c
index 63cc61c..98631e0 100644
--- a/src/fileio.c
+++ b/src/fileio.c
@@ -6163,7 +6163,7 @@
 }
 
 /*
- * Shorten filenames for all buffers.
+ * Shorten filename of a buffer.
  * When "force" is TRUE: Use full path from now on for files currently being
  * edited, both for file name and swap file name.  Try to shorten the file
  * names a bit, if safe to do so.
@@ -6172,34 +6172,44 @@
  * name.
  */
     void
+shorten_buf_fname(buf_T *buf, char_u *dirname, int force)
+{
+    char_u	*p;
+
+    if (buf->b_fname != NULL
+#ifdef FEAT_QUICKFIX
+	    && !bt_nofile(buf)
+#endif
+	    && !path_with_url(buf->b_fname)
+	    && (force
+		|| buf->b_sfname == NULL
+		|| mch_isFullName(buf->b_sfname)))
+    {
+	VIM_CLEAR(buf->b_sfname);
+	p = shorten_fname(buf->b_ffname, dirname);
+	if (p != NULL)
+	{
+	    buf->b_sfname = vim_strsave(p);
+	    buf->b_fname = buf->b_sfname;
+	}
+	if (p == NULL || buf->b_fname == NULL)
+	    buf->b_fname = buf->b_ffname;
+    }
+}
+
+/*
+ * Shorten filenames for all buffers.
+ */
+    void
 shorten_fnames(int force)
 {
     char_u	dirname[MAXPATHL];
     buf_T	*buf;
-    char_u	*p;
 
     mch_dirname(dirname, MAXPATHL);
     FOR_ALL_BUFFERS(buf)
     {
-	if (buf->b_fname != NULL
-#ifdef FEAT_QUICKFIX
-		&& !bt_nofile(buf)
-#endif
-		&& !path_with_url(buf->b_fname)
-		&& (force
-		    || buf->b_sfname == NULL
-		    || mch_isFullName(buf->b_sfname)))
-	{
-	    VIM_CLEAR(buf->b_sfname);
-	    p = shorten_fname(buf->b_ffname, dirname);
-	    if (p != NULL)
-	    {
-		buf->b_sfname = vim_strsave(p);
-		buf->b_fname = buf->b_sfname;
-	    }
-	    if (p == NULL || buf->b_fname == NULL)
-		buf->b_fname = buf->b_ffname;
-	}
+	shorten_buf_fname(buf, dirname, force);
 
 	/* Always make the swap file name a full path, a "nofile" buffer may
 	 * also have a swap file. */