diff --git a/t/class/inherit.t b/t/class/inherit.t
index 9af6b7ab9507b..53e6afc70732c 100644
--- a/t/class/inherit.t
+++ b/t/class/inherit.t
@@ -105,4 +105,12 @@ use A::B;
 EOS
 }
 
+{
+    # https://github.com/Perl/perl5/issues/20891
+    class Test6A 1.23 {}
+    class Test6B 1.23 :isa(Test6A) {}
+
+    pass('class declaration permits VERSION and :ATTRS...');
+}
+
 done_testing;