diff --git a/lib/tree.rb b/lib/tree.rb
index c841b4e..9290425 100644
--- a/lib/tree.rb
+++ b/lib/tree.rb
@@ -849,7 +849,7 @@ def print_tree(level = 0, max_depth = nil, block = lambda { |node, prefix|  puts
 
       return unless max_depth.nil? || level < max_depth # Exit if the max level is defined, and reached.
 
-      children { |child| child.print_tree(level + 1, block) if child } # Child might be 'nil'
+      children { |child| child.print_tree(level + 1, max_depth, block) if child } # Child might be 'nil'
     end
 
   end