diff --git a/test_regress/t/t_bitsel_wire_array_bad.pl b/test_regress/t/t_bitsel_wire_array_bad.pl
index b2b725f30..3a68ce074 100755
--- a/test_regress/t/t_bitsel_wire_array_bad.pl
+++ b/test_regress/t/t_bitsel_wire_array_bad.pl
@@ -10,13 +10,12 @@ if (!$::Driver) { use FindBin; exec("$FindBin::Bin/bootstrap.pl", @ARGV, $0); di
 # Comple time only test
 
 compile (
-	 verilator_flags2 => ["--lint-only"],
-	 fails=>1,
-#	 expect=>
-# TBD better error message, bug509
-#'.*
-#%Error: Exiting due to.*',
-	 );
+    verilator_flags2 => ["--lint-only"],
+    fails=>1,
+    expect=>
+'.*%Error: t/t_bitsel_wire_array_bad.v:\d+: Illegal assignment of constant to unpacked array
+%Error: Exiting due to.*',
+    );
 
 ok(1);
 1;