diff --git a/ChangeLog b/ChangeLog
index 6f55ba7fdd..258cc2b659 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Mon Dec 13 02:45:51 2004  Shugo Maeda  <shugo@ruby-lang.org>
+
+	* ext/curses/curses.c (window_subwin): call NUM2INT() before
+	GetWINDOW(). fixed: [ruby-dev:25161]
+
 Mon Dec 13 00:58:02 2004  Tanaka Akira  <akr@m17n.org>
 
 	* lib/pathname.rb (cleanpath_aggressive): make it private.
diff --git a/ext/curses/curses.c b/ext/curses/curses.c
index 0408fbd6bc..a8952bf186 100644
--- a/ext/curses/curses.c
+++ b/ext/curses/curses.c
@@ -766,22 +766,26 @@ window_initialize(obj, h, w, top, left)
     return obj;
 }
 
-/* def subwin(h, w, top, left) */
+/* def subwin(height, width, top, left) */
 static VALUE
-window_subwin(obj, h, w, top, left)
+window_subwin(obj, height, width, top, left)
     VALUE obj;
-    VALUE h;
-    VALUE w;
+    VALUE height;
+    VALUE width;
     VALUE top;
     VALUE left;
 {
     struct windata *winp;
     WINDOW *window;
     VALUE win;
+    int h, w, t, l;
 
+    h = NUM2INT(height);
+    w = NUM2INT(width);
+    t = NUM2INT(top);
+    l = NUM2INT(left);
     GetWINDOW(obj, winp);
-    window = subwin(winp->window, NUM2INT(h), NUM2INT(w),
-		                  NUM2INT(top), NUM2INT(left));
+    window = subwin(winp->window, h, w, t, l);
     win = prep_window(rb_obj_class(obj), window);
 
     return win;