diff --git a/wolfcrypt/src/wc_port.c b/wolfcrypt/src/wc_port.c
index 165bc4a70..7ececacf4 100644
--- a/wolfcrypt/src/wc_port.c
+++ b/wolfcrypt/src/wc_port.c
@@ -963,6 +963,40 @@ int wolfSSL_CryptHwMutexUnLock(void)
         return 0;
     }
 
+#elif defined(RTTHREAD)
+
+    int wc_InitMutex(wolfSSL_Mutex* m)
+    {
+        int iReturn;
+
+        *m = ( wolfSSL_Mutex ) rt_mutex_create("mutex",RT_IPC_FLAG_FIFO);
+        if( *m != NULL )
+            iReturn = 0;
+        else
+            iReturn = BAD_MUTEX_E;
+
+
+        return iReturn;
+    }
+
+    int wc_FreeMutex(wolfSSL_Mutex* m)
+    {
+        rt_mutex_delete( *m );
+        return 0;
+    }
+
+
+    int wc_LockMutex(wolfSSL_Mutex* m)
+    {
+        /* Assume an infinite block, or should there be zero block? */
+        return rt_mutex_take( *m, RT_WAITING_FOREVER );
+    }
+
+    int wc_UnLockMutex(wolfSSL_Mutex* m)
+    {
+        return rt_mutex_release( *m );
+    }
+
 #elif defined(WOLFSSL_SAFERTOS)
 
     int wc_InitMutex(wolfSSL_Mutex* m)
diff --git a/wolfssl/internal.h b/wolfssl/internal.h
index c9613e25d..df17511d4 100644
--- a/wolfssl/internal.h
+++ b/wolfssl/internal.h
@@ -146,6 +146,8 @@
     /* do nothing, just don't pick Unix */
 #elif defined(FREERTOS) || defined(FREERTOS_TCP) || defined(WOLFSSL_SAFERTOS)
     /* do nothing */
+#elif defined(RTTHREAD)
+    /* do nothing */
 #elif defined(EBSNET)
     /* do nothing */
 #elif defined(FREESCALE_MQX) || defined(FREESCALE_KSDK_MQX)
diff --git a/wolfssl/wolfcrypt/wc_port.h b/wolfssl/wolfcrypt/wc_port.h
index e65d6d8d3..be8caf02e 100644
--- a/wolfssl/wolfcrypt/wc_port.h
+++ b/wolfssl/wolfcrypt/wc_port.h
@@ -207,6 +207,8 @@
     /* do nothing, just don't pick Unix */
 #elif defined(FREERTOS) || defined(FREERTOS_TCP) || defined(WOLFSSL_SAFERTOS)
     /* do nothing */
+#elif defined(RTTHREAD)
+    /* do nothing */
 #elif defined(EBSNET)
     /* do nothing */
 #elif defined(FREESCALE_MQX) || defined(FREESCALE_KSDK_MQX)
@@ -312,6 +314,9 @@
         #include "FreeRTOS.h"
         #include "semphr.h"
 		typedef SemaphoreHandle_t  wolfSSL_Mutex;
+    #elif defined (RTTHREAD)
+        #include "rtthread.h"
+        typedef rt_mutex_t wolfSSL_Mutex;
     #elif defined(WOLFSSL_SAFERTOS)
         typedef struct wolfSSL_Mutex {
             signed char mutexBuffer[portQUEUE_OVERHEAD_BYTES];