1 files changed, 14 insertions, 0 deletions
diff --git a/src/group_gui.cpp b/src/group_gui.cpp
index 8525c883c..667dcaea9 100644
--- a/src/group_gui.cpp
+++ b/src/group_gui.cpp
@@ -29,6 +29,20 @@
 #include "table/strings.h"
 #include "table/sprites.h"
 
+struct grouplist_d {
+	const Group **sort_list;
+	list_d l;                   // General list struct
+};
+assert_compile(WINDOW_CUSTOM_SIZE >= sizeof(grouplist_d));
+
+struct groupveh_d : vehiclelist_d {
+	GroupID group_sel;
+	VehicleID vehicle_sel;
+
+	grouplist_d gl;
+};
+assert_compile(WINDOW_CUSTOM_SIZE >= sizeof(groupveh_d));
+
 struct Sorting {
 	Listing aircraft;
 	Listing roadveh;