diff --git a/img2www.el b/img2www.el
index 0e3e11f..e992358 100644
--- a/img2www.el
+++ b/img2www.el
@@ -1,6 +1,6 @@
 ;;; -*- Emacs-Lisp -*-
 ;;; An interface to img2www script
-;;; (c)1999, 2002, 2005 HIROSE Yuuji [yuuji@gentei.org]
+;;; (c)1999, 2002, 2005, 2017 HIROSE Yuuji [yuuji@gentei.org]
 ;;; Last modified Mon Feb 25 06:30:06 2008 on firestorm
 ;;; Update count: 64
 
@@ -57,7 +57,7 @@
 	      (if (numberp height)
 		  (+ height 2)
 		(/ (* (frame-height)
-		      (string-to-int height))
+		      (string-to-number height))
 		   100)))
 	   (- (frame-height) window-min-height 1))
 	  window-min-height)))