diff --git a/R/data.table.R b/R/data.table.R
index 6594cb928..bac200b8a 100644
--- a/R/data.table.R
+++ b/R/data.table.R
@@ -459,9 +459,9 @@ replace_dot_alias = function(e) {
         if (!len_common_names) stopf("Attempting to do natural join but no common columns in provided tables")
         if (verbose) {
           which_cols_msg = if (len_common_names == length(x)) {
-            catf("Joining but 'x' has no key, natural join using all 'x' columns")
+            catf("Joining but 'x' has no key, natural join using all 'x' columns\n")
           } else {
-            catf("Joining but 'x' has no key, natural join using: %s", brackify(common_names))
+            catf("Joining but 'x' has no key, natural join using: %s\n", brackify(common_names))
           }
         }
         on = common_names