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diff --git a/FreeRTOS-Labs/Source/FreeRTOS-IoT-Libraries/abstractions/mbedtls/threading_alt.h b/FreeRTOS-Labs/Source/FreeRTOS-IoT-Libraries/abstractions/mbedtls/threading_alt.h
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+++ b/FreeRTOS-Labs/Source/FreeRTOS-IoT-Libraries/abstractions/mbedtls/threading_alt.h
@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2018 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+/* mbed TLS threading functions implemented for FreeRTOS. */
+
+#ifndef MBEDTLS_THREADING_ALT_H_
+#define MBEDTLS_THREADING_ALT_H_
+
+/* FreeRTOS includes. */
+#include "FreeRTOS.h"
+#include "semphr.h"
+
+/* mbed TLS mutex type. */
+typedef struct mbedtls_threading_mutex
+{
+    SemaphoreHandle_t mutexHandle;
+    StaticSemaphore_t mutexStorage;
+} mbedtls_threading_mutex_t;
+
+/* mbed TLS mutex functions. */
+void mbedtls_platform_mutex_init( mbedtls_threading_mutex_t * pMutex );
+void mbedtls_platform_mutex_free( mbedtls_threading_mutex_t * pMutex );
+int mbedtls_platform_mutex_lock( mbedtls_threading_mutex_t * pMutex );
+int mbedtls_platform_mutex_unlock( mbedtls_threading_mutex_t * pMutex );
+
+#endif