diff --git a/features/mbedtls/platform/inc/platform_mbed.h b/features/mbedtls/platform/inc/platform_mbed.h
index 8632ec0328..b433f88861 100644
--- a/features/mbedtls/platform/inc/platform_mbed.h
+++ b/features/mbedtls/platform/inc/platform_mbed.h
@@ -21,6 +21,10 @@
 #define MBEDTLS_ENTROPY_HARDWARE_ALT
 #endif
 
+#if defined(DEVICE_RTC)
+#define MBEDTLS_HAVE_TIME_DATE
+#endif
+
 #if defined(MBEDTLS_CONFIG_HW_SUPPORT)
 #include "mbedtls_device.h"
 #endif