diff --git a/Makefile.am b/Makefile.am
index 779b29b7..fce8e76f 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -3,7 +3,7 @@
 
 ACLOCAL_AMFLAGS = -I m4
 
-AM_CXXFLAGS = $(BOOST_CPPFLAGS)
+AM_CXXFLAGS =
 AM_DEFAULT_SOURCE_EXT = .cpp
 
 ###############################################################################
@@ -368,7 +368,7 @@ EXTRA_DIST += ${top_srcdir}/build-aux/wine-crlf.sh
 ###############################################################################
 ## Utility programs
 
-LDADD = $(top_builddir)/libcruft-util.a $(BOOST_LDFLAGS) $(LIBS)
+LDADD = $(top_builddir)/libcruft-util.a $(LIBS)
 
 bin_PROGRAMS = 				\
     tools/json-clean			\
diff --git a/configure.ac b/configure.ac
index ea7c8e78..66a523ff 100644
--- a/configure.ac
+++ b/configure.ac
@@ -101,10 +101,6 @@ NC_DEBUGGING
 
 CHECK_RAGEL([ip.cpp])
 
-NC_BOOST([1.53], [system thread])
-AC_SUBST(BOOST_CPPFLAGS)
-AC_SUBST(BOOST_LDFLAGS)
-
 ###############################################################################
 ## Optional packages
 
diff --git a/stringid.cpp b/stringid.cpp
index 18a734c2..fbf8e385 100644
--- a/stringid.cpp
+++ b/stringid.cpp
@@ -19,8 +19,7 @@
 #include "raii.hpp"
 
 #include <stdexcept>
-#include <boost/thread/mutex.hpp>
-#include <boost/thread/lock_guard.hpp>
+#include <mutex>
 
 using util::stringid;
 
@@ -32,8 +31,8 @@ stringid::add (const std::string key) {
     if (pos != m_map.end ())
         throw std::invalid_argument ("duplicate stringid key");
 
-    static boost::mutex s_lock;
-    boost::lock_guard<boost::mutex> raii (s_lock);
+    static std::mutex s_lock;
+    std::lock_guard<std::mutex> guard (s_lock);
 
     id_t id = m_map.size ();
     m_map[key] = id;