diff --git a/Jamfile b/Jamfile
index 2e247fe0a..cf9b1ea5d 100755
--- a/Jamfile
+++ b/Jamfile
@@ -34,7 +34,7 @@ REQUIREMENTS =
 	<toolset>darwin:<cxxflags>-Wno-unused-variable
 	;
 
-USAGE_REQIREMENTS =
+USAGE_REQUIREMENTS =
 	<include>./include
 	<include>$(BOOST_ROOT)
 	<variant>release:<define>NDEBUG
diff --git a/include/libtorrent/tracker_manager.hpp b/include/libtorrent/tracker_manager.hpp
index 7e853e2a9..a0da0a8dc 100755
--- a/include/libtorrent/tracker_manager.hpp
+++ b/include/libtorrent/tracker_manager.hpp
@@ -142,7 +142,7 @@ namespace libtorrent
 		
 		void tick();
 		void queue_request(
-			tracker_request const& r
+			tracker_request r
 			, request_callback* c = 0
 			, std::string const& password = "");
 		void abort_request(request_callback* c);
diff --git a/src/tracker_manager.cpp b/src/tracker_manager.cpp
index f0a3e70d7..32c6833df 100755
--- a/src/tracker_manager.cpp
+++ b/src/tracker_manager.cpp
@@ -303,7 +303,7 @@ namespace libtorrent
 	}
 
 	void tracker_manager::queue_request(
-		tracker_request const& req
+		tracker_request req
 		, request_callback* c
 		, std::string const& password)
 	{
@@ -318,8 +318,8 @@ namespace libtorrent
 			int port = 80;
 
 			// PARSE URL
-			std::string::const_iterator start = req.url.begin();
-			std::string::const_iterator end
+			std::string::iterator start = req.url.begin();
+			std::string::iterator end
 				= std::find(req.url.begin(), req.url.end(), ':');
 			protocol = std::string(start, end);