diff --git a/composer.json b/composer.json
index b361c0a..377bf02 100644
--- a/composer.json
+++ b/composer.json
@@ -8,7 +8,7 @@
         ]
     },
     "require": {
-        "pre/plugin": "^0.11.0"
+        "pre/plugin": "^0.11.3"
     },
     "require-dev": {
         "phpunit/phpunit": "^5.0|^6.0"
diff --git a/tests/specs/async.spec b/tests/specs/async.spec
index f17ecd6..6ae8580 100644
--- a/tests/specs/async.spec
+++ b/tests/specs/async.spec
@@ -84,15 +84,21 @@ $first = function (): \Amp\Promise {
     });
 };
 
-$second = [$thing = $thing ?? null, "fn" => function () use (&$thing): \Amp\Promise {
-    return \Amp\call(function () use (&$thing) {
-        $this->something();
-        yield $thing;
-    });
-}]["fn"];
+$second = [
+    ($thing = $thing ?? null),
+    "fn" => function () use (&$thing): \Amp\Promise {
+        return \Amp\call(function () use (&$thing) {
+            $this->something();
+            yield $thing;
+        });
+    }
+]["fn"];
 
-$third = [$thing = $thing ?? null, "fn" => function () use (&$thing): \Amp\Promise {
-    return \Amp\call(function () use (&$thing) {
-        yield $thing;
-    });
-}]["fn"];
+$third = [
+    ($thing = $thing ?? null),
+    "fn" => function () use (&$thing): \Amp\Promise {
+        return \Amp\call(function () use (&$thing) {
+            yield $thing;
+        });
+    }
+]["fn"];