diff --git a/common/main/aistruct.h b/common/main/aistruct.h
index 83a03e951..98fd5b4d6 100644
--- a/common/main/aistruct.h
+++ b/common/main/aistruct.h
@@ -310,7 +310,7 @@ struct ai_cloak_info_rw
 #endif
 
 struct point_seg : prohibit_void_ptr<point_seg> {
-	int         segnum;
+	short         segnum;
 	vms_vector  point;
 };
 
diff --git a/similar/main/ai.cpp b/similar/main/ai.cpp
index 6f7b95c21..6336dac0f 100644
--- a/similar/main/ai.cpp
+++ b/similar/main/ai.cpp
@@ -4463,7 +4463,7 @@ static void state_ai_cloak_info_to_ai_cloak_info_rw(ai_cloak_info *aic, ai_cloak
 }
 
 DEFINE_SERIAL_VMS_VECTOR_TO_MESSAGE();
-DEFINE_SERIAL_UDT_TO_MESSAGE(point_seg, p, (p.segnum, p.point));
+DEFINE_SERIAL_UDT_TO_MESSAGE(point_seg, p, (p.segnum, serial::pad<2>(), p.point));
 ASSERT_SERIAL_UDT_MESSAGE_SIZE(point_seg, 16);
 
 DEFINE_SERIAL_MUTABLE_UDT_TO_MESSAGE(point_seg_array_t, p, (static_cast<array<point_seg, MAX_POINT_SEGS> &>(p)));