diff --git a/targets/TARGET_Realtek/TARGET_AMEBA/TARGET_RTL8195A/device/cmsis_nvic.c b/targets/TARGET_Realtek/TARGET_AMEBA/TARGET_RTL8195A/device/cmsis_nvic.c
deleted file mode 100644
index 2ebd17c580..0000000000
--- a/targets/TARGET_Realtek/TARGET_AMEBA/TARGET_RTL8195A/device/cmsis_nvic.c
+++ /dev/null
@@ -1,44 +0,0 @@
-/* mbed Microcontroller Library
- * CMSIS-style functionality to support dynamic vectors
- ******************************************************************************
- * Copyright (c) 2013-2016 Realtek Semiconductor Corp.
- *
- * 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 "cmsis_nvic.h"
-
-#define NVIC_RAM_VECTOR_ADDRESS   (0x10000000)  // Vectors positioned at start of RAM
-#define NVIC_ROM_VECTOR_ADDRESS   (0x00000000)  // Initial vector position at start of ROM
-
-void NVIC_SetVector(IRQn_Type IRQn, uint32_t vector) {
-    uint32_t *vectors = (uint32_t *)SCB->VTOR;
-    uint32_t i;
-
-    // Copy and switch to dynamic vectors if the first time called
-    if (SCB->VTOR != NVIC_RAM_VECTOR_ADDRESS) {
-        uint32_t *old_vectors = vectors;
-        vectors = (uint32_t*)NVIC_RAM_VECTOR_ADDRESS;
-        for (i=0; i<NVIC_NUM_VECTORS; i++) {
-            vectors[i] = old_vectors[i];
-        }
-        SCB->VTOR = (uint32_t)NVIC_RAM_VECTOR_ADDRESS;
-    }
-    vectors[IRQn + NVIC_USER_IRQ_OFFSET] = vector;
-}
-
-uint32_t NVIC_GetVector(IRQn_Type IRQn) {
-    uint32_t *vectors = (uint32_t*)SCB->VTOR;
-    return vectors[IRQn + NVIC_USER_IRQ_OFFSET];
-}
diff --git a/targets/TARGET_Realtek/TARGET_AMEBA/TARGET_RTL8195A/device/cmsis_nvic.h b/targets/TARGET_Realtek/TARGET_AMEBA/TARGET_RTL8195A/device/cmsis_nvic.h
index 7e047d8e9e..9aaf764870 100644
--- a/targets/TARGET_Realtek/TARGET_AMEBA/TARGET_RTL8195A/device/cmsis_nvic.h
+++ b/targets/TARGET_Realtek/TARGET_AMEBA/TARGET_RTL8195A/device/cmsis_nvic.h
@@ -20,23 +20,17 @@
 #ifndef MBED_CMSIS_NVIC_H
 #define MBED_CMSIS_NVIC_H
 
+#define NVIC_RAM_VECTOR_ADDRESS   (0x10000000)  // Vectors positioned at start of RAM
+#define NVIC_ROM_VECTOR_ADDRESS   (0x00000000)  // Initial vector position at start of ROM
+
 // CORE: 64 vectors = 64 bytes from 0x00 to 0x3F
 // MCU Peripherals: 85 vectors = 340 bytes from 0x40 to ...
 // Total: 128 vectors = 512 bytes (0x200) to be reserved in RAM
 #define NVIC_NUM_VECTORS      128
+#ifndef NVIC_USER_IRQ_OFFSET
 #define NVIC_USER_IRQ_OFFSET  64
+#endif
 
 #include "cmsis.h"
 
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-void NVIC_SetVector(IRQn_Type IRQn, uint32_t vector);
-uint32_t NVIC_GetVector(IRQn_Type IRQn);
-
-#ifdef __cplusplus
-}
-#endif
-
 #endif