diff --git a/jerry-core/ecma/operations/ecma-atomics-object.c b/jerry-core/ecma/operations/ecma-atomics-object.c
index 6e2cfd0e9..c42ad8752 100644
--- a/jerry-core/ecma/operations/ecma-atomics-object.c
+++ b/jerry-core/ecma/operations/ecma-atomics-object.c
@@ -192,6 +192,8 @@ ecma_atomic_read_modify_write (ecma_value_t typedarray, /**< typedArray argument
   /* 9. */
   uint32_t indexed_position = ecma_number_to_uint32 (idx) * element_size + offset;
 
+  ecma_free_value (idx);
+
   JERRY_UNUSED (indexed_position);
   JERRY_UNUSED (element_type);
   JERRY_UNUSED (val);
diff --git a/tests/jerry/es.next/regression-test-issue-4894.js b/tests/jerry/es.next/regression-test-issue-4894.js
new file mode 100644
index 000000000..0f2db2c1e
--- /dev/null
+++ b/tests/jerry/es.next/regression-test-issue-4894.js
@@ -0,0 +1,19 @@
+// 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.
+
+var sab = new SharedArrayBuffer(4);
+var a = new Int32Array(sab);
+
+/* TODO: replace with the correct value whenever AtomicModifyWrite is properly implemented */
+assert(Atomics.add(a, -0, 1) === 0);