diff --git a/src/ifcparse/aggregate_of_instance.h b/src/ifcparse/aggregate_of_instance.h
index 754a541972..aff12f426a 100644
--- a/src/ifcparse/aggregate_of_instance.h
+++ b/src/ifcparse/aggregate_of_instance.h
@@ -25,6 +25,7 @@
 
 #include <boost/shared_ptr.hpp>
 #include <set>
+#include <vector>
 
 namespace IfcParse {
     class declaration;