diff --git a/preserves.nimble b/preserves.nimble
index 2176169..cf1676a 100644
--- a/preserves.nimble
+++ b/preserves.nimble
@@ -1,6 +1,6 @@
 # Package
 
-version = "20230503"
+version = "20230504"
 author        = "Emery Hemingway"
 description   = "data model and serialization format"
 license       = "Unlicense"
diff --git a/src/preserves/preserves_schema_nim.nim b/src/preserves/preserves_schema_nim.nim
index e470a63..29257ce 100644
--- a/src/preserves/preserves_schema_nim.nim
+++ b/src/preserves/preserves_schema_nim.nim
@@ -513,7 +513,7 @@ proc addField(recList: PNode; loc: Location; known: var TypeTable; sp: SimplePat
         nn(nkExprColonExpr,
           ident"preservesLiteral",
           toStrLit(loc, sp))))
-    recList.add identDef(scm, id, TypeSpec(node: ident"bool"))
+    recList.add identDef(scm, id, TypeSpec(node: ident"tuple[]"))
   elif sp.orKind == SimplePatternKind.embedded and not scm.hasEmbeddedType:
     let id = nn(nkPragmaExpr,
       id, nn(nkPragma, ident"preservesEmbedded"))