diff --git a/quinn-proto/src/crypto.rs b/quinn-proto/src/crypto.rs
index 59a7634c0..72b4c9015 100644
--- a/quinn-proto/src/crypto.rs
+++ b/quinn-proto/src/crypto.rs
@@ -112,7 +112,7 @@ pub trait Session: Send + Sized {
         &self,
         output: &mut [u8],
         label: &[u8],
-        context: Option<&[u8]>
+        context: Option<&[u8]>,
     ) -> Result<(), Self::ExportKeyingMaterialError>;
 }
 
diff --git a/quinn-proto/src/crypto/rustls.rs b/quinn-proto/src/crypto/rustls.rs
index 08a6b1557..c88863a45 100644
--- a/quinn-proto/src/crypto/rustls.rs
+++ b/quinn-proto/src/crypto/rustls.rs
@@ -225,7 +225,7 @@ impl crypto::Session for TlsSession {
         &self,
         output: &mut [u8],
         label: &[u8],
-        context: Option<&[u8]>
+        context: Option<&[u8]>,
     ) -> Result<(), Self::ExportKeyingMaterialError> {
         let session: &dyn rustls::Session = match &self.inner {
             SessionKind::Client(s) => s,