diff --git a/gcc/rust/parse/rust-parse-impl.h b/gcc/rust/parse/rust-parse-impl.h
index 54885221e18d..bb00460bd324 100644
--- a/gcc/rust/parse/rust-parse-impl.h
+++ b/gcc/rust/parse/rust-parse-impl.h
@@ -5600,6 +5600,7 @@ Parser<ManagedTokenSource>::parse_inherent_impl_item ()
 	    return nullptr;
 	  }
       }
+    case ASYNC:
     case EXTERN_KW:
     case UNSAFE:
     case FN_KW:
diff --git a/gcc/testsuite/rust/compile/issue-2788.rs b/gcc/testsuite/rust/compile/issue-2788.rs
new file mode 100644
index 000000000000..b3828fca6cb0
--- /dev/null
+++ b/gcc/testsuite/rust/compile/issue-2788.rs
@@ -0,0 +1,10 @@
+// { dg-additional-options "-frust-compile-until=lowering" }
+struct Foo {
+    arg_1: u32,
+    arg_2: i32,
+}
+
+impl Foo {
+    async fn asynchronous_function_1(&self) {}
+    async fn asynchronous_function_2() {}
+}