diff --git a/portable/GCC/ARM_CRx_MPU/portmacro.h b/portable/GCC/ARM_CRx_MPU/portmacro.h
index 4ca649f6e..7e80f093e 100644
--- a/portable/GCC/ARM_CRx_MPU/portmacro.h
+++ b/portable/GCC/ARM_CRx_MPU/portmacro.h
@@ -221,6 +221,13 @@ typedef uint32_t TickType_t;
  */
 #define portMEMORY_BARRIER()                         __asm volatile( "" ::: "memory" )
 
+/**
+ * @brief Ensure a symbol isn't removed from the compilation unit.
+ *
+ * @ingroup Port Interface Specifications
+ */
+#define portDONT_DISCARD                             __attribute__( ( used ) )
+
 /**
  * @brief Defines if the tick count can be accessed atomically.
  *