diff --git a/lib/config/options.rb b/lib/config/options.rb
index 8c5b0f1c..e98dfd32 100644
--- a/lib/config/options.rb
+++ b/lib/config/options.rb
@@ -37,9 +37,9 @@ def reload_env!
       hash = Hash.new
 
       ENV.each do |variable, value|
-        keys = variable.to_s.split(Config.env_separator)
+        keys = split(variable)
 
-        prefix = (Config.env_prefix || Config.const_name).to_s.split(Config.env_separator)
+        prefix = split(Config.env_prefix || Config.const_name)
 
         next if keys.shift(prefix.size) != prefix
 
@@ -154,6 +154,10 @@ def []=(param, value)
 
     protected
 
+    def split(string)
+      string.to_s.split(Config.env_separator)
+    end
+
     def descend_array(array)
       array.map do |value|
         if value.instance_of? Config::Options