diff --git a/cli/src/main.rs b/cli/src/main.rs
index 11e203f4d..065be01f8 100644
--- a/cli/src/main.rs
+++ b/cli/src/main.rs
@@ -211,6 +211,8 @@ impl Performer for DocumentAddition {
 
         println!("parsing documents...");
 
+        let reader = BufReader::new(reader);
+
         let documents = match self.format {
             DocumentAdditionFormat::Csv => documents_from_csv(reader)?,
             DocumentAdditionFormat::Json => documents_from_json(reader)?,