diff --git a/plugins/input/postgis/postgis.cpp b/plugins/input/postgis/postgis.cpp
index 7958a6569..de4158bab 100644
--- a/plugins/input/postgis/postgis.cpp
+++ b/plugins/input/postgis/postgis.cpp
@@ -28,6 +28,7 @@
 #include <mapnik/ptree_helpers.hpp>
 
 // boost
+#include <boost/algorithm/string.hpp>
 #include <boost/lexical_cast.hpp>
 #include <boost/tokenizer.hpp>