diff --git a/include/nigiri/types.h b/include/nigiri/types.h
index 978aa025..864b7849 100644
--- a/include/nigiri/types.h
+++ b/include/nigiri/types.h
@@ -114,7 +114,7 @@ using section_db_idx_t = cista::strong<std::uint32_t, struct _section_db_idx>;
 using trip_idx_t = cista::strong<std::uint32_t, struct _trip_idx>;
 using trip_id_idx_t = cista::strong<std::uint32_t, struct _trip_id_str_idx>;
 using transport_idx_t = cista::strong<std::uint32_t, struct _transport_idx>;
-using source_idx_t = cista::strong<std::uint8_t, struct _source_idx>;
+using source_idx_t = cista::strong<std::uint16_t, struct _source_idx>;
 using day_idx_t = cista::strong<std::uint16_t, struct _day_idx>;
 using timezone_idx_t = cista::strong<std::uint8_t, struct _timezone_idx>;
 using merged_trips_idx_t =
@@ -433,4 +433,4 @@ template <>
 struct fmt::formatter<nigiri::debug> : ostream_formatter {};
 
 template <>
-struct fmt::formatter<nigiri::delta> : ostream_formatter {};
\ No newline at end of file
+struct fmt::formatter<nigiri::delta> : ostream_formatter {};