diff --git a/src/datanode/src/region_server.rs b/src/datanode/src/region_server.rs
index 8c4793dd78e8..2c8212ac3c46 100644
--- a/src/datanode/src/region_server.rs
+++ b/src/datanode/src/region_server.rs
@@ -222,7 +222,7 @@ impl RegionServer {
 
     #[tracing::instrument(skip_all)]
     pub async fn handle_read(&self, request: QueryRequest) -> Result<SendableRecordBatchStream> {
-        let permit = if let Some(p) = &self.inner.parallelism {
+        let _permit = if let Some(p) = &self.inner.parallelism {
             Some(p.acquire().await?)
         } else {
             None