diff --git a/conf/defaults.config b/conf/defaults.config
index 3f117cc694..154a3581ca 100644
--- a/conf/defaults.config
+++ b/conf/defaults.config
@@ -1222,9 +1222,7 @@ $pg{specialPGEnvironmentVars}{problemPostamble} = { TeX => '', HTML => '' };
 ${pg}{modules} = [
 	[qw(Encode)],
 	[qw(Encode::Encoding)],
-	[qw(HTML::Parser)],
 	[qw(HTML::Entities)],
-	[qw(DynaLoader)],
 	[qw(Encode)],
 	[qw(Exporter )],
 	[qw(GD)],
@@ -1261,7 +1259,7 @@ ${pg}{modules} = [
 	[qw(Locale::Maketext)],
 	[qw(WeBWorK::PG::Localize)],
 	[qw(Mojo::JSON)],
-	[qw(Rserve Class::Tiny IO::Handle)],
+	[qw(Rserve)],
 	[qw(DragNDrop)],
 	[qw(Types::Serialiser)],
 	[qw(strict)],