diff --git a/spec/stack_spec.rb b/spec/stack_spec.rb
index 07a5f25..d0cafb8 100644
--- a/spec/stack_spec.rb
+++ b/spec/stack_spec.rb
@@ -1,39 +1,35 @@
 require 'stack'
 
 describe Stack do
-  let(:stack)  { Stack.new }
-
   context 'by default' do
     it 'starts out empty' do
-      stack.empty?.should be_true
+      subject.should be_empty
     end
   end
 
   context 'pushing elements' do
     it 'can be pushed an element' do
-      stack.should be_empty
-      stack.push(1)
-      stack.size.should == 1
+      subject.push(1)
+      subject.size.should == 1
     end
 
     it 'can be pushed many elements at once' do
-      stack.should be_empty
-      stack.push(1, 2, 3, 4, 5)
-      stack.size.should == 5
+      subject.push(1, 2, 3, 4, 5)
+      subject.size.should == 5
     end
   end
 
   context 'popping elements' do
     it 'allows you to pop the last pushed element' do
-      stack.push(:foo, :bar)
-      stack.pop.should == :bar
-      stack.pop.should == :foo
-      stack.should be_empty
+      subject.push(:foo, :bar)
+      subject.pop.should == :bar
+      subject.pop.should == :foo
+      subject.should be_empty
     end
 
     it 'raises when popping an empty stack' do
-      stack.should be_empty
-      expect { stack.pop }.to raise_error(Stack::EmptyStackError)
+      subject.should be_empty
+      expect { subject.pop }.to raise_error(Stack::EmptyStackError)
     end
   end
 end