diff --git a/ets2panda/checker/ets/object.cpp b/ets2panda/checker/ets/object.cpp
index 63b773041d3e79286d070beb32f93153d5344656..b61b73fcec26c3b1677c9c48c29817761b42e9a4 100644
--- a/ets2panda/checker/ets/object.cpp
+++ b/ets2panda/checker/ets/object.cpp
@@ -1730,6 +1730,13 @@ bool ETSChecker::ValidateTupleIndex(const ETSTupleType *const tuple, ir::MemberE
         return false;
     }
 
+    if (expr->Property()->IsAssignmentExpression()) {
+        if (reportError) {
+            LogError(diagnostic::TUPLE_INDEX_NONCONST, {}, expr->Property()->Start());
+        }
+        return false;
+    }
+
     auto exprValue = GetTupleElementAccessValue(expr->Property());
     if (!exprValue.has_value() || (*exprValue >= tuple->GetTupleSize())) {
         if (reportError) {
diff --git a/ets2panda/test/ast/compiler/ets/constant_expression_test/constant_expression_test.ets b/ets2panda/test/ast/compiler/ets/constant_expression_test/constant_expression_test.ets
new file mode 100644
index 0000000000000000000000000000000000000000..8a8a7fa5113cdb10df07fcb38928d96cfd8d1a19
--- /dev/null
+++ b/ets2panda/test/ast/compiler/ets/constant_expression_test/constant_expression_test.ets
@@ -0,0 +1,23 @@
+/*
+ * Copyright (c) 2025 Huawei Device Co., Ltd.
+ * 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.
+ */
+
+function main(): int {
+    let tuple: [number, number] = [0,5];
+    tuple[/* @@ label */MathPartialSums.g_flag = 0] = 12; 
+    return 0;
+}
+
+/* @@@ label Error TypeError: Unresolved reference MathPartialSums */
+/* @@@ label Error TypeError: Only constant expression allowed for element access on tuples. */