--- i/lib/Moo.pm
+++ w/lib/Moo.pm
@@ -15,7 +15,7 @@ sub import {
   return if $MAKERS{$target}; # already exported into this package
   *{_getglob("${target}::extends")} = sub {
     _load_module($_) for @_;
-    *{_getglob("${target}::ISA")} = \@_;
+    *{_getglob("${target}::ISA")} = [@_];
   };
   *{_getglob("${target}::with")} = sub {
     require Moo::Role;