diff --git a/src/map.c b/src/map.c
index 4822eb8cb..b35b0ad7f 100644
--- a/src/map.c
+++ b/src/map.c
@@ -1439,7 +1439,7 @@ bool Map_UnveilTile(uint16 packed, uint8 houseID)
 	s = Structure_Get_ByPackedTile(packed);
 	if (s != NULL) {
 		s->o.seenByHouses |= 1 << houseID;
-		if (s->o.houseID == HOUSE_ATREIDES) s->o.seenByHouses |= 1 << HOUSE_FREMEN;
+		if (houseID == HOUSE_ATREIDES) s->o.seenByHouses |= 1 << HOUSE_FREMEN;
 	}
 
 	Map_UnveilTile_Neighbour(packed);