1 files changed, 1 insertions, 1 deletions

diff --git a/examples/std/src/tuntap.rs b/examples/std/src/tuntap.rs
index 09a4be070..b70767a3a 100644
--- a/examples/std/src/tuntap.rs
+++ b/examples/std/src/tuntap.rs
@@ -209,7 +209,7 @@ impl Device for TunTapDevice {
         }
     }
 
-    fn capabilities(&mut self) -> DeviceCapabilities {
+    fn capabilities(&self) -> DeviceCapabilities {
         let mut caps = DeviceCapabilities::default();
         caps.max_transmission_unit = self.device.get_ref().mtu;
         caps