diff --git a/lib/fog/bin/aws.rb b/lib/fog/bin/aws.rb
index 31bca6316..d04fc36c6 100644
--- a/lib/fog/bin/aws.rb
+++ b/lib/fog/bin/aws.rb
@@ -86,6 +86,8 @@ class AWS < Fog::Bin
           Fog::Storage.new(:provider => 'AWS')
         when :sns
           Fog::AWS::SNS.new
+        when :sts
+          Fog::AWS::STS.new
         else
           raise ArgumentError, "Unrecognized service: #{key.inspect}"
         end