diff --git a/lib/delayed/master/config.rb b/lib/delayed/master/config.rb
index <HASH>..<HASH> 100644
--- a/lib/delayed/master/config.rb
+++ b/lib/delayed/master/config.rb
@@ -36,7 +36,7 @@ module Delayed
 
       SIMPLE_CONFIGS.each do |key|
         define_method(key) do |value = nil|
-          if value
+          if !value.nil?
             @data[key] = value
           else
             @data[key]
Allow to set false value for master config