diff --git a/include/QF/zone.h b/include/QF/zone.h
index b19aef350..56dbbcc8f 100644
--- a/include/QF/zone.h
+++ b/include/QF/zone.h
@@ -27,6 +27,8 @@
 #ifndef __QF_zone_h
 #define __QF_zone_h
 
+#include "QF/qtypes.h"
+
 /** \defgroup zone Memory Management
 	\ingroup utils