diff --git a/gcc/cp/ChangeLog b/gcc/cp/ChangeLog
index 8c333fe8b45..60c4cd7c9d4 100644
--- a/gcc/cp/ChangeLog
+++ b/gcc/cp/ChangeLog
@@ -1,3 +1,8 @@
+2003-06-17  Mark Mitchell  <mark@codesourcery.com>
+
+	* mangle.c (mangle_conv_op_name_for_type): Correct sprintf format
+	string.
+
 2003-06-17  Jason Merrill  <jason@redhat.com>
 
 	PR c++/10929
diff --git a/gcc/cp/mangle.c b/gcc/cp/mangle.c
index 4c536625199..63a8bd731b2 100644
--- a/gcc/cp/mangle.c
+++ b/gcc/cp/mangle.c
@@ -2628,7 +2628,8 @@ mangle_conv_op_name_for_type (const tree type)
     return TREE_VALUE ((tree) *slot);
 
   /* Create a unique name corresponding to TYPE.  */
-  sprintf (buffer, "operator %d\n", htab_elements (conv_type_names));
+  sprintf (buffer, "operator %lu\n", 
+	   (unsigned long) htab_elements (conv_type_names));
   identifier = get_identifier (buffer);
   *slot = build_tree_list (type, identifier);