diff --git a/R/4_maps.R b/R/4_maps.R
index ec55608..d4a9e81 100644
--- a/R/4_maps.R
+++ b/R/4_maps.R
@@ -246,15 +246,15 @@ definition = function(con, fun, src, v, subset, dst, ...) {
   cr = merge(cr, bio, by = 'bio_id')
 
 
-  o = future_lapply( unique(cr$cell_id), 
-      function(i){
+  o = future_lapply(unique(cr$cell_id), 
+      function(i, ...) {
         x = cr[cell_id == i]
         E = try(fun(x, ...), silent = TRUE)
         E = data.table(E)
         E[, cell_id := i]
         E
 
-        }, future.seed = TRUE )
+        }, ..., future.seed = TRUE)
 
   o = rbindlist(o, fill = TRUE)