diff -bu IO-Interactive-1.021-oDSvaS/lib/IO/Interactive.pm~ IO-Interactive-1.021-oDSvaS/lib/IO/Interactive.pm
--- IO-Interactive-1.021-oDSvaS/lib/IO/Interactive.pm~	2016-01-27 21:30:37.000000000 +0100
+++ IO-Interactive-1.021-oDSvaS/lib/IO/Interactive.pm	2016-06-15 17:47:49.000000000 +0200
@@ -120,7 +120,7 @@
         no strict 'refs';
         my $impl = *{$package.'::'.$request}{CODE};
         require Carp;
-        Carp::croak "Unknown subroutine ($request()) requested"
+        Carp::croak("Unknown subroutine (".$request."()) requested")
             if !$impl || $request =~ m/\A _/xms;
         *{$caller.'::'.$request} = $impl;
     }