diff --git a/src/protocol/parser/pass_definitions.rs b/src/protocol/parser/pass_definitions.rs
index 5c88f9d9ed4ccee019a04b1f0a21ae5ca1a7a999..7a48893e72677a23ba5654dfbc30215d74d61db1 100644
--- a/src/protocol/parser/pass_definitions.rs
+++ b/src/protocol/parser/pass_definitions.rs
@@ -224,7 +224,8 @@ impl PassDefinitions {
                 let value = if has_embedded {
                     types_section.into_vec()
                 } else {
-                    types_section.forget()
+                    types_section.forget();
+                    Vec::new()
                 };
 
                 Ok(UnionVariantDefinition{