diff --git a/spec/PUGX/Poser/Render/SvgFlatRenderSpec.php b/spec/PUGX/Poser/Render/SvgFlatRenderSpec.php
index 2b37382..3f79d2e 100644
--- a/spec/PUGX/Poser/Render/SvgFlatRenderSpec.php
+++ b/spec/PUGX/Poser/Render/SvgFlatRenderSpec.php
@@ -9,8 +9,9 @@
 
 class SvgFlatRenderSpec extends ObjectBehavior
 {
-    function let(TextSizeCalculatorInterface $calculator)
+    function let($calculator)
     {
+        $calculator->beADoubleOf('\PUGX\Poser\Calculator\TextSizeCalculatorInterface');
         $calculator->calculateWidth(Argument::any())->willReturn(20);
         $this->beConstructedWith($calculator);
     }
diff --git a/spec/PUGX/Poser/Render/SvgFlatSquareRenderSpec.php b/spec/PUGX/Poser/Render/SvgFlatSquareRenderSpec.php
index c4bf07f..6abc733 100644
--- a/spec/PUGX/Poser/Render/SvgFlatSquareRenderSpec.php
+++ b/spec/PUGX/Poser/Render/SvgFlatSquareRenderSpec.php
@@ -5,15 +5,14 @@
 use PhpSpec\ObjectBehavior;
 use Prophecy\Argument;
 use PUGX\Poser\Badge;
-use PUGX\Poser\Calculator\TextSizeCalculatorInterface;
 
 class SvgFlatSquareRenderSpec extends ObjectBehavior
 {
-    function let(TextSizeCalculatorInterface $calculator)
+    function let($calculator)
     {
+        $calculator->beADoubleOf('\PUGX\Poser\Calculator\TextSizeCalculatorInterface');
         $calculator->calculateWidth(Argument::any())->willReturn(20);
-        $realCalculator = $calculator->getWrappedObject();
-        $this->beConstructedWith($realCalculator);
+        $this->beConstructedWith($calculator);
     }
 
     function it_should_render_a_svg()
diff --git a/spec/PUGX/Poser/Render/SvgRenderSpec.php b/spec/PUGX/Poser/Render/SvgRenderSpec.php
index 6029883..2793036 100644
--- a/spec/PUGX/Poser/Render/SvgRenderSpec.php
+++ b/spec/PUGX/Poser/Render/SvgRenderSpec.php
@@ -5,12 +5,12 @@
 use PhpSpec\ObjectBehavior;
 use Prophecy\Argument;
 use PUGX\Poser\Badge;
-use PUGX\Poser\Calculator\TextSizeCalculatorInterface;
 
 class SvgRenderSpec extends ObjectBehavior
 {
-    function let(TextSizeCalculatorInterface $calculator)
+    function let($calculator)
     {
+        $calculator->beADoubleOf('\PUGX\Poser\Calculator\TextSizeCalculatorInterface');
         $calculator->calculateWidth(Argument::any())->willReturn(20);
         $this->beConstructedWith($calculator);
     }