diff --git a/UNITTESTS/features/cellular/framework/AT/at_cellulardevice/unittest.cmake b/UNITTESTS/features/cellular/framework/AT/at_cellulardevice/unittest.cmake
index 36b69e0dbe3..2032004348a 100644
--- a/UNITTESTS/features/cellular/framework/AT/at_cellulardevice/unittest.cmake
+++ b/UNITTESTS/features/cellular/framework/AT/at_cellulardevice/unittest.cmake
@@ -35,4 +35,5 @@ set(unittest-test-sources
   stubs/EventQueue_stub.cpp 
   stubs/FileHandle_stub.cpp 
   stubs/mbed_assert_stub.cpp
+  stubs/CellularDevice_stub.cpp
 )
diff --git a/UNITTESTS/stubs/CellularDevice_stub.cpp b/UNITTESTS/stubs/CellularDevice_stub.cpp
new file mode 100644
index 00000000000..aba5fc8f041
--- /dev/null
+++ b/UNITTESTS/stubs/CellularDevice_stub.cpp
@@ -0,0 +1,39 @@
+/*
+ * Copyright (c) , Arm Limited and affiliates.
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * 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.
+ */
+
+#include "CellularDevice.h"
+#include "EventQueue.h"
+#include "CellularUtil.h"
+
+namespace mbed {
+
+MBED_WEAK CellularDevice *CellularDevice::get_default_instance()
+{
+    return NULL;
+}
+
+CellularDevice::CellularDevice() : _network_ref_count(0), _sms_ref_count(0), _power_ref_count(0), _sim_ref_count(0),
+        _info_ref_count(0)
+{
+}
+
+events::EventQueue *CellularDevice::get_queue() const
+{
+    return NULL;
+}
+
+}