diff --git a/jerry-core/parser/js/js-scanner-ops.c b/jerry-core/parser/js/js-scanner-ops.c
index c789f2522..6fa8bd171 100644
--- a/jerry-core/parser/js/js-scanner-ops.c
+++ b/jerry-core/parser/js/js-scanner-ops.c
@@ -242,6 +242,12 @@ scanner_check_arrow_arg (parser_context_t *context_p, /**< context */
   scanner_pop_literal_pool (context_p, scanner_context_p);
 
   parser_stack_pop_uint8 (context_p);
+
+  if (context_p->stack_top_uint8 == SCAN_STACK_USE_ASYNC)
+  {
+    scanner_add_async_literal (context_p, scanner_context_p);
+  }
+
   parser_stack_push_uint8 (context_p, SCAN_STACK_PAREN_EXPRESSION);
 
   if (process_arrow)
diff --git a/tests/jerry/es.next/regresssion-test-issue-3908.js b/tests/jerry/es.next/regresssion-test-issue-3908.js
new file mode 100644
index 000000000..2f47c152e
--- /dev/null
+++ b/tests/jerry/es.next/regresssion-test-issue-3908.js
@@ -0,0 +1,20 @@
+// Copyright JS Foundation and other contributors, http://js.foundation
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+try {
+  eval("async(a,b+)")
+  assert(false)
+} catch (e) {
+  assert(e instanceof SyntaxError)
+}