diff --git a/astute/lib/astute/config.rb b/astute/lib/astute/config.rb
index 9509203d7..4b80863bb 100644
--- a/astute/lib/astute/config.rb
+++ b/astute/lib/astute/config.rb
@@ -1,10 +1,6 @@
 require 'symboltable'
 require 'singleton'
 
-class SymbolTable
-  include Singleton
-end
-
 module Astute
   class ConfigError < StandardError; end
   class UnknownOptionError < ConfigError
@@ -16,6 +12,15 @@ module Astute
     end
   end
 
+  class MyConfig
+    include Singleton
+    attr_reader :configtable
+
+    def initialize
+      @configtable = SymbolTable.new
+    end
+  end
+
   class ParseError < ConfigError
     attr_reader :line
 
@@ -26,7 +31,7 @@ module Astute
   end
 
   def self.config
-    config = SymbolTable.instance
+    config = MyConfig.instance.configtable
     config.update(default_config) if config.empty?
     return config
   end
diff --git a/naily/lib/naily/config.rb b/naily/lib/naily/config.rb
index 0f379d3b5..f954873f6 100644
--- a/naily/lib/naily/config.rb
+++ b/naily/lib/naily/config.rb
@@ -1,10 +1,6 @@
 require 'symboltable'
 require 'singleton'
 
-class SymbolTable
-  include Singleton
-end
-
 module Naily
   class ConfigError < StandardError; end
   class UnknownOptionError < ConfigError
@@ -16,6 +12,17 @@ module Naily
     end
   end
 
+  class MyConfig
+    include Singleton
+    attr_reader :configtable
+
+    def initialize
+      # We need new instance of SymbolTable. If we use singleton for SymbolTable,
+      #   the same instance will be used in Astute.
+      @configtable = SymbolTable.new
+    end
+  end
+
   class ParseError < ConfigError
     attr_reader :line
 
@@ -26,7 +33,7 @@ module Naily
   end
 
   def self.config
-    config = SymbolTable.instance
+    config = MyConfig.instance.configtable
     config.update(default_config) if config.empty?
     return config
   end