--- ncurses-ruby-1.3.1/form_wrap.c~	2011-05-31 02:41:46.000000000 +0300
+++ ncurses-ruby-1.3.1/form_wrap.c	2013-09-14 16:29:00.504646018 +0300
@@ -1131,7 +1131,7 @@
 		  char msg[500];
 		  snprintf(msg, 500, "The validation functions for this field type need %d additional arguments.",(int)(NUM2INT(argc)-1));
 		  msg[499]=0;
-		  rb_raise(rb_eArgError, msg);	
+		  rb_raise(rb_eArgError, "%s", msg);	
 		}
 	 } 
   }