diff --git a/ChangeLog b/ChangeLog
index a124a836..eca6ce98 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2010-06-22  Tatsuhiro Tsujikawa  <t-tujikawa@users.sourceforge.net>
+
+	Added missing parameter to log message.
+	* src/UTMetadataRequestFactory.cc
+
 2010-06-22  Tatsuhiro Tsujikawa  <t-tujikawa@users.sourceforge.net>
 
 	Made test code not use /tmp
diff --git a/src/UTMetadataRequestFactory.cc b/src/UTMetadataRequestFactory.cc
index 11240f0a..8f075882 100644
--- a/src/UTMetadataRequestFactory.cc
+++ b/src/UTMetadataRequestFactory.cc
@@ -57,7 +57,9 @@ void UTMetadataRequestFactory::create
     SharedHandle<Piece> p = pieceStorage->getMissingPiece(index);
     if(p.isNull()) {
       if(logger_->debug()) {
-        logger_->debug("ut_metadata piece %lu is used or already acquired.");
+        logger_->debug
+          ("ut_metadata piece %lu is used or already acquired.",
+           static_cast<unsigned long>(index));
       }
       continue;
     }