diff --git a/src/lib.rs b/src/lib.rs
index 416fedd..de1782e 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,3 +1,5 @@
+#![deny(clippy::all)]
+
 mod clientside;
 mod data_device;
 mod server;
diff --git a/src/server/tests.rs b/src/server/tests.rs
index 75e63f0..47f51ec 100644
--- a/src/server/tests.rs
+++ b/src/server/tests.rs
@@ -547,7 +547,7 @@ impl TestFixture {
 
         let serial = self.surface_serial;
         let serial_lo = (serial & 0xFF) as u32;
-        let serial_hi = (serial >> 8 & 0xFF) as u32;
+        let serial_hi = ((serial >> 8) & 0xFF) as u32;
         self.surface_serial += 1;
 
         xwl.send_request(Req::<XwaylandSurfaceV1>::SetSerial {