diff --git a/crates/duckdb/examples/hello-ext/main.rs b/crates/duckdb/examples/hello-ext/main.rs
index fb5c8046..2e2dd1c7 100644
--- a/crates/duckdb/examples/hello-ext/main.rs
+++ b/crates/duckdb/examples/hello-ext/main.rs
@@ -68,7 +68,7 @@ impl VTab for HelloVTab {
 
         unsafe {
             if (*init_info).done {
-                output.set_len(0);
+                data_chunk.set_len(0);
             } else {
                 (*init_info).done = true;
                 data_chunk.reserve(1);