diff --git a/src/machine/system_calls.rs b/src/machine/system_calls.rs
index 01c6fae2..e34b6ccb 100644
--- a/src/machine/system_calls.rs
+++ b/src/machine/system_calls.rs
@@ -4709,7 +4709,7 @@ impl Machine {
             let err = self.machine_st.permission_error(
                 Permission::Reposition,
                 atom!("stream"),
-                vec![stream_as_cell!(stream)],
+                stream_as_cell!(stream),
             );
 
             return Err(self.machine_st.error_form(err, stub));