diff --git a/include/regex_filter.hpp b/include/regex_filter.hpp
index b13139b65..807990dc9 100644
--- a/include/regex_filter.hpp
+++ b/include/regex_filter.hpp
@@ -25,7 +25,6 @@
 #include "expression.hpp"
 
 #include <boost/regex.hpp>
-#include <iostream>
 
 namespace mapnik
 {