diff --git a/src/Stage.php b/src/Stage.php
index adb4783..ab95ea3 100644
--- a/src/Stage.php
+++ b/src/Stage.php
@@ -2,7 +2,7 @@
 
 namespace Descom\Pipeline;
 
-interface Stage
+abstract class Stage
 {
     /**
      * Process the payload.
@@ -11,5 +11,5 @@ interface Stage
      *
      * @return mixed
      */
-    public function __invoke($payload);
+    abstract public function __invoke($payload);
 }
diff --git a/tests/Support/AddStage.php b/tests/Support/AddStage.php
index a5260ed..61b2a11 100644
--- a/tests/Support/AddStage.php
+++ b/tests/Support/AddStage.php
@@ -4,7 +4,7 @@
 
 use Descom\Pipeline\Stage;
 
-class AddStage implements Stage
+class AddStage extends Stage
 {
     public function __invoke($payload)
     {
diff --git a/tests/Support/DoubleStage.php b/tests/Support/DoubleStage.php
index 2fa2b2b..5ac19e4 100644
--- a/tests/Support/DoubleStage.php
+++ b/tests/Support/DoubleStage.php
@@ -4,7 +4,7 @@
 
 use Descom\Pipeline\Stage;
 
-class DoubleStage implements Stage
+class DoubleStage extends Stage
 {
     public function __invoke($payload)
     {