diff --git a/crates/rust/src/interface.rs b/crates/rust/src/interface.rs
index b7bf24f12..93af07d98 100644
--- a/crates/rust/src/interface.rs
+++ b/crates/rust/src/interface.rs
@@ -795,7 +795,7 @@ pub mod vtable{ordinal} {{
                         wit_import,
                         stream,
                         address.add(total * {size}),
-                        u32::try_from(values.len()).unwrap()
+                        u32::try_from(values.len() - (total * {size})).unwrap()
                     ).await
                 }};