diff --git a/src/graph/graph_io.cc b/src/graph/graph_io.cc
index 6ab426bf6ba21576daea0b2e71f9af26aa8a30eb..0e020d7079f796b3f48890715a231a9e594ed8ce 100644
--- a/src/graph/graph_io.cc
+++ b/src/graph/graph_io.cc
@@ -18,7 +18,6 @@
 #include <boost/python/extract.hpp>
 
 #include <iostream>
-#include <boost/algorithm/string.hpp>
 #include <boost/iostreams/categories.hpp>
 #include <boost/iostreams/filtering_stream.hpp>
 #include <boost/iostreams/filter/gzip.hpp>
diff --git a/src/graph/str_repr.hh b/src/graph/str_repr.hh
index 978a3e6ba09ddec9b9227749b406fb515482b735..0b37b4e204098269622686ad5de80574570cad9c 100644
--- a/src/graph/str_repr.hh
+++ b/src/graph/str_repr.hh
@@ -21,7 +21,6 @@
 #include <iostream>
 #include <clocale>
 #include <boost/lexical_cast.hpp>
-#include <boost/algorithm/string.hpp>
 
 //
 // Data type string representation