diff --git a/tasks/phpstan/phpstan.neon b/tasks/phpstan/phpstan.neon
index 1785a595e4..0f1990c710 100644
--- a/tasks/phpstan/phpstan.neon
+++ b/tasks/phpstan/phpstan.neon
@@ -16,5 +16,6 @@ parameters:
   reportUnmatchedIgnoredErrors: false
   dynamicConstantNames:
     - WP_DEBUG
+    - MAILPOET_PREMIUM_INITIALIZED
 includes:
   - phpstan-baseline.neon # https://medium.com/@ondrejmirtes/phpstans-baseline-feature-lets-you-hold-new-code-to-a-higher-standard-e77d815a5dff