diff --git a/serialization/object_serialization.nim b/serialization/object_serialization.nim
index 828cf4a..81de903 100644
--- a/serialization/object_serialization.nim
+++ b/serialization/object_serialization.nim
@@ -150,7 +150,7 @@ template enumAllSerializedFields*(T: type, body): untyped =
     enumAllSerializedFieldsImpl(T, body)
 
 func isCaseObject*(T: type): bool {.compileTime.} =
-  genExpr:
+  genSimpleExpr:
     enumAllSerializedFields(T):
       if fieldCaseDiscriminator != "":
         return newLit(true)
diff --git a/tests/test_object_serialization.nim b/tests/test_object_serialization.nim
index 49bd6eb..1ca35cd 100644
--- a/tests/test_object_serialization.nim
+++ b/tests/test_object_serialization.nim
@@ -1,6 +1,6 @@
 import
   typetraits, unittest,
-  stew/shims/macros,
+  stew/shims/macros, stew/objects,
   ../serialization/object_serialization,
   ../serialization/testing/generic_suite