diff --git a/targets/TARGET_Realtek/TARGET_AMEBA/sdk/common/drivers/wlan/realtek/include/autoconf.h b/targets/TARGET_Realtek/TARGET_AMEBA/sdk/common/drivers/wlan/realtek/include/autoconf.h
index c2505cf3c7..a72f9a3eae 100644
--- a/targets/TARGET_Realtek/TARGET_AMEBA/sdk/common/drivers/wlan/realtek/include/autoconf.h
+++ b/targets/TARGET_Realtek/TARGET_AMEBA/sdk/common/drivers/wlan/realtek/include/autoconf.h
@@ -109,7 +109,7 @@
 
 #if defined(CONFIG_PLATFORM_AMEBA_X)
 	#if !defined(CONFIG_PLATFORM_8711B)
-		#define CONFIG_USE_TCM_HEAP 1					/* USE TCM HEAP */
+		#define CONFIG_USE_TCM_HEAP 0					/* USE TCM HEAP */
 	#endif
 	#define CONFIG_RECV_TASKLET_THREAD
 	#define CONFIG_XMIT_TASKLET_THREAD
diff --git a/targets/TARGET_Realtek/TARGET_AMEBA/sdk/os/os_dep/include/osdep_service.h b/targets/TARGET_Realtek/TARGET_AMEBA/sdk/os/os_dep/include/osdep_service.h
index f3e91d4b2c..0d290c2bf7 100644
--- a/targets/TARGET_Realtek/TARGET_AMEBA/sdk/os/os_dep/include/osdep_service.h
+++ b/targets/TARGET_Realtek/TARGET_AMEBA/sdk/os/os_dep/include/osdep_service.h
@@ -35,7 +35,7 @@ extern "C" {
 
 #if defined(CONFIG_PLATFORM_8195A)
 	#ifndef CONFIG_USE_TCM_HEAP
-	#define CONFIG_USE_TCM_HEAP 1					/* USE TCM HEAP */
+	#define CONFIG_USE_TCM_HEAP 0					/* USE TCM HEAP */
 	#endif
 	#define USE_MUTEX_FOR_SPINLOCK	1
 #endif