diff --git a/src/gui_w32.c b/src/gui_w32.c
index cfd4b78..1fdc993 100644
--- a/src/gui_w32.c
+++ b/src/gui_w32.c
@@ -2261,12 +2261,8 @@
 #ifdef FEAT_MBYTE
 	if (has_mbyte)
 	{
-	    int cell_len = 0;
-
 	    /* Compute the length in display cells. */
-	    for (n = 0; n < len; n += MB_BYTE2LEN(text[n]))
-		cell_len += (*mb_ptr2cells)(text + n);
-	    rc.right = FILL_X(col + cell_len);
+	    rc.right = FILL_X(col + mb_string2cells(text, len));
 	}
 	else
 #endif