diff --git a/rust/cubestore/cubestore/src/sql/mod.rs b/rust/cubestore/cubestore/src/sql/mod.rs
index ee9dcd09129db..a0811825b7e5e 100644
--- a/rust/cubestore/cubestore/src/sql/mod.rs
+++ b/rust/cubestore/cubestore/src/sql/mod.rs
@@ -3645,6 +3645,7 @@ mod tests {
                                 file.write_all(format!("{},San Francisco,\"[\"\"Foo\"\",\"\"Bar\"\",\"\"FooBar\"\"]\",\"2021-01-24 12:12:23 UTC\"\n", i).as_bytes()).await.unwrap();
                             }
 
+                            file.flush().await.unwrap();
                             file.shutdown().await.unwrap();
 
                             vec![path_1, path_2]