diff --git a/lib/yawpa.rb b/lib/yawpa.rb
index 6507372..431aefb 100644
--- a/lib/yawpa.rb
+++ b/lib/yawpa.rb
@@ -13,44 +13,34 @@ module Yawpa
 
   module_function
   def parse(params, options)
+    options = _massage_options(options)
     opts = {}
     args = []
     i = 0
     while i < params.length
       param = params[i]
-      if param =~ /^(--?)([^=]+)(?:=(.+))?$/
-        leader, param_name, val = $1, $2, $3
-        case leader.length
-        when 2
-          param_key = if options[param_name]
-                        param_name
-                      elsif options[param_name.to_sym]
-                        param_name.to_sym
-                      else
-                        nil
-                      end
-          if param_key.nil?
-            raise UnknownOptionException.new("Unknown option '#{param_name}'")
+      if param =~ /^--([^=]+)(?:=(.+))?$/
+        param_name, val = $1, $2
+        if options[param_name].nil?
+          raise UnknownOptionException.new("Unknown option '#{param_name}'")
+        end
+        opt_config = options[param_name]
+        param_key = opt_config[:key]
+        if opt_config[:nargs].last == 0
+          opts[param_key] = true
+        else
+          opts[param_key] = []
+          opts[param_key] << val if val
+          if opts[param_key].length < opt_config[:nargs].last
+            gathered = _gather(i + 1, opt_config[:nargs].last - opts[param_key].length, params)
+            i += gathered.length
+            opts[param_key] += gathered
+            if opts[param_key].length < opt_config[:nargs].first
+              raise InvalidArgumentsException.new("Not enough arguments supplied for option '#{param_name}'")
+            end
           end
-          opt_config = options[param_key]
-          nargs = opt_config[:nargs] || 0
-          if nargs == 0
-            opts[param_key] = true
-          else
-            nargs = (nargs..nargs) if nargs.class == Fixnum
-            opts[param_key] = []
-            opts[param_key] << val if val
-            if opts[param_key].length < nargs.last
-              gathered = _gather(i + 1, nargs.last - opts[param_key].length, params)
-              i += gathered.length
-              opts[param_key] += gathered
-              if opts[param_key].length < nargs.first
-                raise InvalidArgumentsException.new("Not enough arguments supplied for option '#{param_name}'")
-              end
-            end
-            if opts[param_key].length == 1
-              opts[param_key] = opts[param_key].first
-            end
+          if opts[param_key].length == 1
+            opts[param_key] = opts[param_key].first
           end
         end
       else
@@ -73,4 +63,16 @@ module Yawpa
     end
     result
   end
+
+  def _massage_options(options)
+    {}.tap do |newopts|
+      options.each_pair do |k, v|
+        newkey = k.to_s
+        newopts[newkey] = {key: k}
+        nargs = v[:nargs] || 0
+        nargs = (nargs..nargs) if nargs.class == Fixnum
+        newopts[newkey][:nargs] = nargs
+      end
+    end
+  end
 end