diff --git a/src/protocol/eval/value.rs b/src/protocol/eval/value.rs
index 6b8295c4f7537c0ed15d1d82341b525408e67c2d..fb743f3b77cc324198f44ab08f9cee141593f724 100644
--- a/src/protocol/eval/value.rs
+++ b/src/protocol/eval/value.rs
@@ -141,6 +141,7 @@ impl Value {
     pub(crate) fn get_heap_pos(&self) -> Option<HeapPos> {
         match self {
             Value::Message(v) => Some(*v),
+            Value::String(v) => Some(*v),
             Value::Array(v) => Some(*v),
             Value::Union(_, v) => Some(*v),
             Value::Struct(v) => Some(*v),