diff --git a/R/merge_gtfs.R b/R/merge_gtfs.R
index d63029c..fc9333c 100644
--- a/R/merge_gtfs.R
+++ b/R/merge_gtfs.R
@@ -158,7 +158,7 @@ merge_gtfs <- function(..., files = NULL, prefix = FALSE) {
       # field_value, from translations, doesn't end with _id but refers to an
       # id, thus should be changed.
 
-      id_cols <- names(dt)[(grepl("_id$", names(dt)))]
+      id_cols <- names(dt)[grepl("_id$|parent_station", names(dt))]
       id_cols <- setdiff(id_cols, "direction_id")
       if (!is.null(dt[["field_value"]])) id_cols <- c(id_cols, "field_value")