diff --git a/system/Test/Mock/MockCache.php b/system/Test/Mock/MockCache.php
index 85b5fd9e7e14..b410df874243 100644
--- a/system/Test/Mock/MockCache.php
+++ b/system/Test/Mock/MockCache.php
@@ -31,7 +31,7 @@ class MockCache extends BaseHandler implements CacheInterface
     /**
      * Expiration times.
      *
-     * @var ?list<int>
+     * @var array<string, int|null>
      */
     protected $expirations = [];
 
diff --git a/utils/phpstan-baseline/loader.neon b/utils/phpstan-baseline/loader.neon
index 150b8c87bf6d..e1758784aa82 100644
--- a/utils/phpstan-baseline/loader.neon
+++ b/utils/phpstan-baseline/loader.neon
@@ -53,6 +53,5 @@ includes:
     - return.unusedType.neon
     - staticMethod.notFound.neon
     - ternary.shortNotAllowed.neon
-    - unset.offset.neon
     - varTag.type.neon
     - variable.undefined.neon
diff --git a/utils/phpstan-baseline/unset.offset.neon b/utils/phpstan-baseline/unset.offset.neon
deleted file mode 100644
index 42c26f2fa213..000000000000
--- a/utils/phpstan-baseline/unset.offset.neon
+++ /dev/null
@@ -1,8 +0,0 @@
-# total 1 error
-
-parameters:
-    ignoreErrors:
-        -
-            message: '#^Cannot unset offset string on list\<int\>\|null\.$#'
-            count: 2
-            path: ../../system/Test/Mock/MockCache.php