Index: lily/music-iterator.cc
--- lily/music-iterator.cc.orig
+++ lily/music-iterator.cc
@@ -190,7 +190,7 @@ Music_iterator::print_smob (SCM port, scm_print_state 
 {
   char s[1000];
 
-  sprintf (s, "#<%s>", class_name ());
+  snprintf (s, sizeof(s), "#<%s>", class_name ());
   scm_puts (s, port);
   return 1;
 }
