diff --git a/ets2panda/checker/ets/object.cpp b/ets2panda/checker/ets/object.cpp
index a0628a3398fe73f27387804698ea632c0f31f431..c792501b303ffea9f80121ca402667c01defbe88 100644
--- a/ets2panda/checker/ets/object.cpp
+++ b/ets2panda/checker/ets/object.cpp
@@ -1809,7 +1809,9 @@ ETSObjectType *ETSChecker::CheckThisOrSuperAccess(ir::Expression *node, ETSObjec
         return classType;
     }
 
-    if (classType->GetDeclNode()->IsClassDefinition() && classType->GetDeclNode()->AsClassDefinition()->IsGlobal()) {
+    if (classType->GetDeclNode()->IsClassDefinition() &&
+        (classType->GetDeclNode()->AsClassDefinition()->IsGlobal() ||
+         classType->GetDeclNode()->AsClassDefinition()->IsNamespaceTransformed())) {
         LogError(diagnostic::CTOR_REF_INVALID_CTX_GLOBAL, {msg}, node->Start());
         return GlobalBuiltinErrorType();
     }
diff --git a/ets2panda/test/ast/compiler/ets/invalid_this_in_namespace.ets b/ets2panda/test/ast/compiler/ets/invalid_this_in_namespace.ets
new file mode 100644
index 0000000000000000000000000000000000000000..8145aabd6bdb1dec342715a67b5f6ae44e7a49e4
--- /dev/null
+++ b/ets2panda/test/ast/compiler/ets/invalid_this_in_namespace.ets
@@ -0,0 +1,20 @@
+/*
+ * 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.
+ */
+
+namespace X {
+    this.toString()
+}
+
+/* @@? 17:5 Error TypeError: Cannot reference 'this' in this context.  */