diff --git a/src/runtime/c/pgf/data.c b/src/runtime/c/pgf/data.c
index 3e159fa6f..0146d6ad6 100644
--- a/src/runtime/c/pgf/data.c
+++ b/src/runtime/c/pgf/data.c
@@ -32,9 +32,11 @@ GU_DEFINE_TYPE(PgfCCat, abstract);
 
 GU_DEFINE_TYPE(PgfCncCat, abstract);
 
-GU_DEFINE_TYPE(PgfFlags, GuStringMap, gu_type(GuVariant), &gu_null_variant);
+GU_DEFINE_TYPE(PgfDummyVariant, GuVariant);
 
-GU_DEFINE_TYPE(PgfProductionSeq, GuSeq, gu_type(GuVariant));
+GU_DEFINE_TYPE(PgfFlags, GuStringMap, gu_type(PgfDummyVariant), &gu_null_variant);
+
+GU_DEFINE_TYPE(PgfProductionSeq, GuSeq, gu_type(PgfDummyVariant));
 
 GU_DEFINE_TYPE(PgfAbsFun, abstract);