diff --git a/src/net/server/middleware/xfr/service.rs b/src/net/server/middleware/xfr/service.rs
index 8f330eaba..cb4f33f51 100644
--- a/src/net/server/middleware/xfr/service.rs
+++ b/src/net/server/middleware/xfr/service.rs
@@ -111,6 +111,11 @@ where
         xfr_data_provider: XDP,
         max_concurrency: usize,
     ) -> Self {
+        let max_concurrency = if max_concurrency > 0 {
+            max_concurrency
+        } else {
+            1
+        };
         let zone_walking_semaphore =
             Arc::new(Semaphore::new(max_concurrency));
         let batcher_semaphore = Arc::new(Semaphore::new(max_concurrency));