diff --git a/include/qpdf/QPDF.hh b/include/qpdf/QPDF.hh
index 634c9bd1..c8dfcc88 100644
--- a/include/qpdf/QPDF.hh
+++ b/include/qpdf/QPDF.hh
@@ -30,6 +30,7 @@
 #include <map>
 #include <list>
 #include <iostream>
+#include <vector>
 
 #include <qpdf/QPDFExc.hh>
 #include <qpdf/QPDFObjGen.hh>