diff --git a/R/geco_filters.R b/R/geco_filters.R
index 69397b3..92fd9e7 100644
--- a/R/geco_filters.R
+++ b/R/geco_filters.R
@@ -136,5 +136,6 @@
   updates <- rlang::list2(...)
   updates <- .check_format(updates)
   filter %>%
-    purrr::list_merge(!!!updates)
+    purrr::list_merge(!!!updates) %>%
+    purrr::map_depth(2, unique)
 }