diff --git a/R/adversarial_rf.R b/R/adversarial_rf.R
index 79bae3ce..15e2595e 100644
--- a/R/adversarial_rf.R
+++ b/R/adversarial_rf.R
@@ -128,9 +128,12 @@ adversarial_rf <- function(
       nodeIDs <- stats::predict(rf0, x_real, type = 'terminalNodes')$predictions
       tmp <- data.table('tree' = rep(seq_len(num_trees), each = n), 
                         'leaf' = as.vector(nodeIDs))
-      x_real_dt <- rbindlist(lapply(seq_len(num_trees), function(b) {
+      x_real_dt <- do.call(rbind, lapply(seq_len(num_trees), function(b) {
         cbind(x_real, tmp[tree == b])
       }))
+      x_real_dt[, factor_cols] <- setDF(
+        lapply(x_real_dt[, factor_cols, drop = FALSE], as.numeric)
+      )
       tmp <- tmp[sample(.N, n, replace = TRUE)]
       tmp <- unique(tmp[, cnt := .N, by = .(tree, leaf)])
       draw_from <- merge(tmp, x_real_dt, by = c('tree', 'leaf'),