--- rxvt-unicode/src/rxvtfont.C	2014/11/07 13:45:55	1.193
+++ rxvt-unicode/src/rxvtfont.C	2014/11/14 11:06:49	1.194
@@ -1047,7 +1047,8 @@
 
   bool slow = this->slow
               || width  != term->fwidth
-              || height != term->fheight;
+              || height != term->fheight
+              || ascent != f->ascent;
 
   int base = ascent; // sorry, incorrect: term->fbase;