diff --git a/xo-reader2/src/reader2/reader2_register_facets.cpp b/xo-reader2/src/reader2/reader2_register_facets.cpp
index eb39f6ac..e45d542f 100644
--- a/xo-reader2/src/reader2/reader2_register_facets.cpp
+++ b/xo-reader2/src/reader2/reader2_register_facets.cpp
@@ -47,6 +47,7 @@
 namespace xo {
     using xo::print::APrintable;
     using xo::facet::FacetRegistry;
+    using xo::facet::TypeRegistry;
     using xo::facet::typeseq;
 
     namespace scm {
@@ -93,6 +94,9 @@ namespace xo {
             FacetRegistry::register_impl<ASyntaxStateMachine, DParenSsm>();
             FacetRegistry::register_impl<APrintable, DParenSsm>();
 
+            // misc types showing up in aux arena
+            TypeRegistry::register_type<SchematikaParser>();
+
             log && log(xtag("DExprSeqState.tseq", typeseq::id<DExprSeqState>()));
             log && log(xtag("DDefineSsm.tseq", typeseq::id<DDefineSsm>()));
             log && log(xtag("DLambdaSsm.tseq", typeseq::id<DLambdaSsm>()));