diff --git a/src/Observable/Exception/CompletedError.php b/src/Observable/Exception/CompletedError.php
index 6fb65c1..35a2b24 100644
--- a/src/Observable/Exception/CompletedError.php
+++ b/src/Observable/Exception/CompletedError.php
@@ -9,7 +9,7 @@
 
 namespace Icicle\Observable\Exception;
 
-class CompletedError extends \Exception implements Exception
+class CompletedError extends \Exception implements Error
 {
     /**
      * @param string|null $message
diff --git a/src/Observable/Internal/Placeholder.php b/src/Observable/Internal/Placeholder.php
index 4e99dc5..603fdee 100644
--- a/src/Observable/Internal/Placeholder.php
+++ b/src/Observable/Internal/Placeholder.php
@@ -11,7 +11,6 @@
 
 use Icicle\Awaitable\Awaitable;
 use Icicle\Awaitable\Delayed;
-use Icicle\Loop;
 
 final class Placeholder
 {