diff --git a/src/closures.rs b/src/closures.rs
index 638955948e9..f698f494ae5 100644
--- a/src/closures.rs
+++ b/src/closures.rs
@@ -275,6 +275,7 @@ fn rewrite_closure_fn_decl(
     let coro = match coroutine_kind {
         Some(ast::CoroutineKind::Async { .. }) => "async ",
         Some(ast::CoroutineKind::Gen { .. }) => "gen ",
+        Some(ast::CoroutineKind::AsyncGen { .. }) => "async gen ",
         None => "",
     };
     let mover = if matches!(capture, ast::CaptureBy::Value { .. }) {
diff --git a/src/utils.rs b/src/utils.rs
index 4392763cea6..7d7bbf11529 100644
--- a/src/utils.rs
+++ b/src/utils.rs
@@ -79,6 +79,7 @@ pub(crate) fn format_coro(coroutine_kind: &ast::CoroutineKind) -> &'static str {
     match coroutine_kind {
         ast::CoroutineKind::Async { .. } => "async ",
         ast::CoroutineKind::Gen { .. } => "gen ",
+        ast::CoroutineKind::AsyncGen { .. } => "async gen ",
     }
 }