diff --git a/src/Util.php b/src/Util.php
index ead8e82..db3634e 100644
--- a/src/Util.php
+++ b/src/Util.php
@@ -126,7 +126,7 @@ public static function ensureNot($valueToThrowOn, $valueToCheck, $exception = nu
      */
     private static function buildException($exception, array $exceptionArgs = null) : Throwable
     {
-        if ($exception instanceof Exception) {
+        if ($exception instanceof Throwable) {
             return $exception;
         }
 
diff --git a/tests/UtilTest.php b/tests/UtilTest.php
index 3ff46d4..a893bc2 100644
--- a/tests/UtilTest.php
+++ b/tests/UtilTest.php
@@ -2,12 +2,14 @@
 
 namespace TraderInteractive;
 
+use Error;
 use Throwable;
 use TraderInteractive\Util as Utility;
 use ErrorException;
 use Exception;
 use InvalidArgumentException;
 use PHPUnit\Framework\TestCase;
+use TypeError;
 
 /**
  * @coversDefaultClass \TraderInteractive\Util
@@ -256,6 +258,16 @@ public function ensureSuccess()
         $this->assertTrue(Utility::ensure(true, is_string('boo')));
     }
 
+    /**
+     * @test
+     * @covers ::ensure
+     */
+    public function ensureSuccessWithErrorObject()
+    {
+        $error = new Error('the error');
+        $this->assertTrue(Util::ensure(true, is_string('foo'), $error));
+    }
+
     /**
      * @test
      * @covers ::ensure
@@ -322,6 +334,18 @@ public function ensureException()
         Utility::ensure(true, false, new Exception('foo', 2));
     }
 
+    /**
+     * @test
+     * @covers ::ensure
+     */
+    public function ensureThrowsErrorObject()
+    {
+        $error = new TypeError('the error');
+        $this->expectException(TypeError::class);
+        $this->expectExceptionMessage($error->getMessage());
+        Utility::ensure(true, false, $error);
+    }
+
     /**
      * @test
      * @covers ::setExceptionAliases