diff --git a/src/FantasyLand/Primitive.php b/src/FantasyLand/Primitive.php
deleted file mode 100644
index 043dbc9..0000000
--- a/src/FantasyLand/Primitive.php
+++ /dev/null
@@ -1,11 +0,0 @@
-<?php
-namespace Widmogrod\FantasyLand;
-
-interface Primitive extends
-    Pointed,
-    Monoid,
-    Setoid,
-    Functor
-{
-
-}
diff --git a/src/Primitive/Listt.php b/src/Primitive/Listt.php
index 96b4af8..1c0738a 100644
--- a/src/Primitive/Listt.php
+++ b/src/Primitive/Listt.php
@@ -6,8 +6,9 @@
 use Widmogrod\Functional as f;
 
 class Listt implements
-    FantasyLand\Primitive,
     FantasyLand\Monad,
+    FantasyLand\Monoid,
+    FantasyLand\Setoid,
     FantasyLand\Foldable,
     FantasyLand\Traversable,
     Common\ValueOfInterface
diff --git a/src/Primitive/Stringg.php b/src/Primitive/Stringg.php
index 556d2aa..72d3d9c 100644
--- a/src/Primitive/Stringg.php
+++ b/src/Primitive/Stringg.php
@@ -5,7 +5,9 @@
 use Widmogrod\FantasyLand;
 
 class Stringg implements
-    FantasyLand\Primitive,
+    FantasyLand\Pointed,
+    FantasyLand\Monoid,
+    FantasyLand\Setoid,
     Common\ValueOfInterface
 {
     const of = 'Widmogrod\Primitive\Stringg::of';