diff --git a/psalm.baseline.xml b/psalm.baseline.xml
index 106b34b4..e30fcc33 100644
--- a/psalm.baseline.xml
+++ b/psalm.baseline.xml
@@ -71,6 +71,10 @@
       <code>$t[1]-&gt;personal</code>
       <code>$t[1]-&gt;personal</code>
     </MixedArgument>
+    <MixedArgumentTypeCoercion occurrences="2">
+      <code>$mailboxes</code>
+      <code>$mailboxes</code>
+    </MixedArgumentTypeCoercion>
     <MixedAssignment occurrences="12">
       <code>$value</code>
       <code>$to</code>