diff --git a/index-scheduler/src/lib.rs b/index-scheduler/src/lib.rs
index 3ad546eb4..1e551f9f8 100644
--- a/index-scheduler/src/lib.rs
+++ b/index-scheduler/src/lib.rs
@@ -1190,7 +1190,7 @@ mod tests {
     pub fn read_json(
         bytes: &[u8],
         write: impl Write + Seek,
-    ) -> std::result::Result<usize, DocumentFormatError> {
+    ) -> std::result::Result<u64, DocumentFormatError> {
         let temp_file = NamedTempFile::new().unwrap();
         let mut buffer = BufWriter::new(temp_file.reopen().unwrap());
         buffer.write_all(bytes).unwrap();
diff --git a/meilisearch-types/src/document_formats.rs b/meilisearch-types/src/document_formats.rs
index f3b4d090f..dc9555fd9 100644
--- a/meilisearch-types/src/document_formats.rs
+++ b/meilisearch-types/src/document_formats.rs
@@ -101,7 +101,7 @@ impl ErrorCode for DocumentFormatError {
 internal_error!(DocumentFormatError: io::Error);
 
 /// Reads CSV from input and write an obkv batch to writer.
-pub fn read_csv(file: &File, writer: impl Write + Seek) -> Result<usize> {
+pub fn read_csv(file: &File, writer: impl Write + Seek) -> Result<u64> {
     let mut builder = DocumentsBatchBuilder::new(writer);
     let mmap = unsafe { MmapOptions::new().map(file)? };
     let csv = csv::Reader::from_reader(mmap.as_ref());
@@ -110,16 +110,16 @@ pub fn read_csv(file: &File, writer: impl Write + Seek) -> Result<usize> {
     let count = builder.documents_count();
     let _ = builder.into_inner().map_err(Into::into).map_err(DocumentFormatError::Internal)?;
 
-    Ok(count as usize)
+    Ok(count as u64)
 }
 
 /// Reads JSON from temporary file  and write an obkv batch to writer.
-pub fn read_json(file: &File, writer: impl Write + Seek) -> Result<usize> {
+pub fn read_json(file: &File, writer: impl Write + Seek) -> Result<u64> {
     read_json_inner(file, writer, PayloadType::Json)
 }
 
 /// Reads JSON from temporary file  and write an obkv batch to writer.
-pub fn read_ndjson(file: &File, writer: impl Write + Seek) -> Result<usize> {
+pub fn read_ndjson(file: &File, writer: impl Write + Seek) -> Result<u64> {
     read_json_inner(file, writer, PayloadType::Ndjson)
 }
 
@@ -128,7 +128,7 @@ fn read_json_inner(
     file: &File,
     writer: impl Write + Seek,
     payload_type: PayloadType,
-) -> Result<usize> {
+) -> Result<u64> {
     let mut builder = DocumentsBatchBuilder::new(writer);
     let mmap = unsafe { MmapOptions::new().map(file)? };
     let mut deserializer = serde_json::Deserializer::from_slice(&mmap);
@@ -155,7 +155,7 @@ fn read_json_inner(
     let count = builder.documents_count();
     let _ = builder.into_inner().map_err(Into::into).map_err(DocumentFormatError::Internal)?;
 
-    Ok(count as usize)
+    Ok(count as u64)
 }
 
 /// The actual handling of the deserialization process in serde
diff --git a/meilisearch/src/routes/indexes/documents.rs b/meilisearch/src/routes/indexes/documents.rs
index fa769a8c7..ce2df00a0 100644
--- a/meilisearch/src/routes/indexes/documents.rs
+++ b/meilisearch/src/routes/indexes/documents.rs
@@ -279,7 +279,7 @@ async fn document_addition(
     .await;
 
     let documents_count = match documents_count {
-        Ok(Ok(documents_count)) => documents_count as u64,
+        Ok(Ok(documents_count)) => documents_count,
         // in this case the file has not possibly be persisted.
         Ok(Err(e)) => return Err(e),
         Err(e) => {