diff --git a/lib/MetaCPAN/Config.pm b/lib/MetaCPAN/Config.pm
index ece5b73..2ae2f54 100644
--- a/lib/MetaCPAN/Config.pm
+++ b/lib/MetaCPAN/Config.pm
@@ -8,6 +8,7 @@ use Moo;
 
 use Carp            qw(cluck croak);
 use Module::Runtime qw(require_module);
+use Ref::Util       qw(is_plain_hashref);
 
 use namespace::clean;