diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3eb4983b5..46e4a6f33 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -100,7 +100,7 @@ endif()
 if(CYGWIN OR MSVC OR WIN32)
   set(Boost_USE_STATIC_LIBS 1)
 endif()
-find_package(Boost 1.40 COMPONENTS serialization system chrono filesystem thread REQUIRED)
+find_package(Boost 1.40 COMPONENTS serialization system filesystem thread REQUIRED)
 
 # General build settings
 include_directories(
diff --git a/gtsam/base/timing.cpp b/gtsam/base/timing.cpp
index 305f86a74..1388c2f18 100644
--- a/gtsam/base/timing.cpp
+++ b/gtsam/base/timing.cpp
@@ -20,6 +20,7 @@
 #include <stdio.h>
 #include <iostream>
 #include <iomanip>
+#include <sys/time.h>
 #include <stdlib.h>
 #include <boost/foreach.hpp>
 #include <boost/format.hpp>
@@ -152,13 +153,15 @@ const boost::shared_ptr<TimingOutline>& TimingOutline::child(size_t child, const
 void TimingOutline::tic() {
 	assert(!timerActive_);
 	timerActive_ = true;
-	t0_ = clock_t::now();
+	gettimeofday(&t0_, NULL);
 }
 
 /* ************************************************************************* */
 void TimingOutline::toc() {
+	struct timeval t;
+	gettimeofday(&t, NULL);
 	assert(timerActive_);
-	add(boost::chrono::duration_cast<duration_t>(clock_t::now() - t0_).count());
+	add(t.tv_sec*1000000 + t.tv_usec - (t0_.tv_sec*1000000 + t0_.tv_usec));
 	timerActive_ = false;
 }
 
@@ -241,11 +244,9 @@ void Timing::print() {
 
 /* ************************************************************************* */
 double _tic_() {
-  typedef boost::chrono::high_resolution_clock clock_t;
-  typedef boost::chrono::duration<double> duration_t;
-
-  clock_t::time_point t = clock_t::now();
-  return boost::chrono::duration_cast< duration_t >(t.time_since_epoch()).count();
+  struct timeval t;
+  gettimeofday(&t, NULL);
+  return ((double)t.tv_sec + ((double)t.tv_usec)/1000000.);
 }
 
 /* ************************************************************************* */
diff --git a/gtsam/base/timing.h b/gtsam/base/timing.h
index 56ac1a762..94498c3b3 100644
--- a/gtsam/base/timing.h
+++ b/gtsam/base/timing.h
@@ -22,7 +22,6 @@
 #include <vector>
 #include <boost/shared_ptr.hpp>
 #include <boost/weak_ptr.hpp>
-#include <boost/chrono.hpp>
 
 class TimingOutline;
 extern boost::shared_ptr<TimingOutline> timingRoot;
@@ -30,9 +29,6 @@ extern boost::weak_ptr<TimingOutline> timingCurrent;
 
 class TimingOutline {
 protected:
-  typedef boost::chrono::high_resolution_clock clock_t;
-  typedef boost::chrono::microseconds duration_t;
-
   size_t t_;
   double t2_ ; /* cache the \sum t_i^2 */
   size_t tIt_;
@@ -43,7 +39,7 @@ protected:
 
   boost::weak_ptr<TimingOutline> parent_;
   std::vector<boost::shared_ptr<TimingOutline> > children_;
-  clock_t::time_point t0_;
+  struct timeval t0_;
   bool timerActive_;
 
   void add(size_t usecs);