diff --git a/EGkSurfAux.h b/EGkSurfAux.h
index 9a64191..35dc363 100644
--- a/EGkSurfAux.h
+++ b/EGkSurfAux.h
@@ -15,6 +15,7 @@
 
 #include "/EgtDev/Include/EGkCurveComposite.h"
 #include "/EgtDev/Include/EGkSurf.h"
+#include "/EgtDev/Include/EGkSurfFlatRegion.h"
 #include "/EgtDev/Include/EGkGeoCollection.h"