diff --git a/ChangeLog b/ChangeLog
index ff056578..7c50046a 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2009-02-10  Tatsuhiro Tsujikawa  <t-tujikawa@users.sourceforge.net>
+
+	Removed tests giving -1 for unsigned argument.
+	* test/SingleFileDownloadContextTest.cc
+
 2009-02-10  Tatsuhiro Tsujikawa  <t-tujikawa@users.sourceforge.net>
 
 	Don't use sha256 in tests because it might not be supported by the
diff --git a/test/SingleFileDownloadContextTest.cc b/test/SingleFileDownloadContextTest.cc
index c99cb015..cf696abb 100644
--- a/test/SingleFileDownloadContextTest.cc
+++ b/test/SingleFileDownloadContextTest.cc
@@ -32,7 +32,6 @@ void SingleFileDownloadContextTest::testGetPieceHash()
   pieceHashes.push_back("0001");
   pieceHashes.push_back("0002");
   ctx.setPieceHashes(pieceHashes);
-  CPPUNIT_ASSERT_EQUAL(std::string(""), ctx.getPieceHash(-1));
   CPPUNIT_ASSERT_EQUAL(std::string("0000"), ctx.getPieceHash(0));
   CPPUNIT_ASSERT_EQUAL(std::string(""), ctx.getPieceHash(3));
 }