diff --git a/ChangeLog b/ChangeLog
index 4a6a598f..ce7b2a53 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2009-12-03  Tatsuhiro Tsujikawa  <t-tujikawa@users.sourceforge.net>
+
+	Fixed type of tail to uint64_t
+	* src/util.cc
+
 2009-12-03  Tatsuhiro Tsujikawa  <t-tujikawa@users.sourceforge.net>
 
 	Added --interface option.  This feature binds sockets to given
diff --git a/src/util.cc b/src/util.cc
index 35c56158..18743c48 100644
--- a/src/util.cc
+++ b/src/util.cc
@@ -565,7 +565,7 @@ void parsePrioritizePieceRange
     } else if(util::startsWith(*i, "tail=")) {
       std::string sizestr = std::string((*i).begin()+(*i).find("=")+1,
 					(*i).end());
-      size_t tail = std::max((int64_t)0, getRealSize(sizestr));
+      uint64_t tail = std::max((int64_t)0, getRealSize(sizestr));
       for(std::vector<SharedHandle<FileEntry> >::const_iterator fi =
 	    fileEntries.begin(); fi != fileEntries.end(); ++fi) {
 	if((*fi)->getLength() == 0) {