diff --git a/include/boost/graph/read_dimacs.hpp b/include/boost/graph/read_dimacs.hpp
index 656e226d..2100b316 100644
--- a/include/boost/graph/read_dimacs.hpp
+++ b/include/boost/graph/read_dimacs.hpp
@@ -16,6 +16,7 @@
 
 #include <vector>
 #include <iostream>
+#include <string>
 #include <cstdio>
 #include <cstring>
 #include <cstdlib>