diff --git a/src/script/api/script_roadtypelist.cpp b/src/script/api/script_roadtypelist.cpp
index f49f763371..038436116d 100644
--- a/src/script/api/script_roadtypelist.cpp
+++ b/src/script/api/script_roadtypelist.cpp
@@ -17,7 +17,7 @@ ScriptRoadTypeList::ScriptRoadTypeList(ScriptRoad::RoadTramTypes rtts)
 {
 	for (RoadType rt = ROADTYPE_BEGIN; rt != ROADTYPE_END; rt++) {
 		if (!HasBit(rtts, GetRoadTramType(rt))) continue;
-		if (ScriptObject::GetCompany() == OWNER_DEITY || ::HasRoadTypeAvail(ScriptObject::GetCompany(), rt) &&
+		if ((ScriptObject::GetCompany() == OWNER_DEITY || ::HasRoadTypeAvail(ScriptObject::GetCompany(), rt)) &&
 				!HasBit(GetRoadTypeInfo(rt)->extra_flags, RXTF_NOT_AVAILABLE_AI_GS)) {
 			this->AddItem(rt);
 		}