diff --git a/lib/cancan/ability.rb b/lib/cancan/ability.rb
index b98d569..9e825ba 100644
--- a/lib/cancan/ability.rb
+++ b/lib/cancan/ability.rb
@@ -264,6 +264,7 @@ module CanCan
     end
 
     def fully_authorized!(action, subject)
+      subject = subject.class.to_s.underscore.pluralize.to_sym unless subject.kind_of?(Symbol) || subject.kind_of?(String)
       @fully_authorized ||= []
       @fully_authorized << [action.to_sym, subject.to_sym]
     end
diff --git a/spec/cancan/ability_spec.rb b/spec/cancan/ability_spec.rb
index d3ba811..eedc49b 100644
--- a/spec/cancan/ability_spec.rb
+++ b/spec/cancan/ability_spec.rb
@@ -261,6 +261,8 @@ describe CanCan::Ability do
     @ability.should_not be_fully_authorized(:update, :ranges)
     @ability.authorize! "update", "ranges"
     @ability.should_not be_fully_authorized(:update, :ranges)
+    @ability.authorize! :update, 1..3
+    @ability.should be_fully_authorized(:update, :ranges)
   end
 
   it "is not fully authorized when a block exists but no instance is used" do
@@ -269,6 +271,8 @@ describe CanCan::Ability do
     end
     @ability.authorize! :update, :ranges
     @ability.should_not be_fully_authorized(:update, :ranges)
+    @ability.authorize! :update, 1..3
+    @ability.should be_fully_authorized(:update, :ranges)
   end
 
   it "is not fully authorized when attributes are required but not checked in update/create actions" do