diff --git a/quinn-proto/src/connection/mod.rs b/quinn-proto/src/connection/mod.rs
index 936cbb827..316408645 100644
--- a/quinn-proto/src/connection/mod.rs
+++ b/quinn-proto/src/connection/mod.rs
@@ -371,7 +371,7 @@ where
             }
         }
 
-        if self.path.anti_amplification_blocked(self.mtu) {
+        if self.path.anti_amplification_blocked(self.mtu.into()) {
             trace!("blocked by anti-amplification");
             return None;
         }
@@ -1481,7 +1481,7 @@ where
             return;
         }
 
-        if self.path.anti_amplification_blocked(self.mtu) {
+        if self.path.anti_amplification_blocked(self.mtu.into()) {
             // We wouldn't be able to send anything, so don't bother.
             self.timers.stop(Timer::LossDetection);
             return;
diff --git a/quinn-proto/src/connection/paths.rs b/quinn-proto/src/connection/paths.rs
index 646126c2b..37f207401 100644
--- a/quinn-proto/src/connection/paths.rs
+++ b/quinn-proto/src/connection/paths.rs
@@ -65,9 +65,9 @@ impl PathData {
     }
 
     /// Indicates whether we're a server that hasn't validated the peer's address and hasn't
-    /// received enough data from the peer to permit additional sending
-    pub fn anti_amplification_blocked(&self, mtu: u16) -> bool {
-        !self.validated && self.total_recvd * 3 < self.total_sent + u64::from(mtu)
+    /// received enough data from the peer to permit sending `bytes_to_send` additional bytes
+    pub fn anti_amplification_blocked(&self, bytes_to_send: u64) -> bool {
+        !self.validated && self.total_recvd * 3 < self.total_sent + bytes_to_send
     }
 }