diff --git a/extractor/restriction_parser.hpp b/extractor/restriction_parser.hpp
index 097e15d9a..11f94ee21 100644
--- a/extractor/restriction_parser.hpp
+++ b/extractor/restriction_parser.hpp
@@ -30,7 +30,7 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #include "../data_structures/restriction.hpp"
 
-#include <boost/optional/optional_fwd.hpp>
+#include <boost/optional/optional.hpp>
 
 #include <string>
 #include <vector>