diff --git a/tests/Debug/Type/ObjectTest.php b/tests/Debug/Type/ObjectTest.php
index b5986ca4..91427d96 100644
--- a/tests/Debug/Type/ObjectTest.php
+++ b/tests/Debug/Type/ObjectTest.php
@@ -675,7 +675,7 @@ static function ($foo, $bar) {
                                 : null,
                             'desc' => PHP_VERSION_ID >= 70100
                                 ? 'Interface summary'
-                                : null,
+                                : '',
                             'isFinal' => false,
                             'type' => null,
                             'value' => 'never change',
@@ -975,7 +975,7 @@ public function testAbstraction()
                 'declaredPrev' => null,
                 'desc' => PHP_VERSION_ID >= 70100
                     ? 'Inherited description'
-                    : null,
+                    : '',
                 'isFinal' => false,
                 'type' => null,
                 'value' => 'defined in TestBase',
@@ -992,7 +992,7 @@ public function testAbstraction()
                     : null,
                 'desc' => PHP_VERSION_ID >= 70100
                     ? 'constant documentation'
-                    : null,
+                    : '',
                 'isFinal' => false,
                 'type' => null,
                 'value' => 'redefined in Test',
diff --git a/tests/Debug/data/ConfusableIdentifiers.php b/tests/Debug/data/ConfusableIdentifiers.php
index cd062221..b053fb90 100644
--- a/tests/Debug/data/ConfusableIdentifiers.php
+++ b/tests/Debug/data/ConfusableIdentifiers.php
@@ -39,7 +39,7 @@
             'declaredPrev' => null,
             'desc' => PHP_VERSION_ID >= 70100
                 ? '[𐊢]onst <b>desc</b>'
-                : null,
+                : '',
             'isFinal' => false,
             'type' => null,
             'value' => 'fσo',