diff --git a/include/mbedtls/config.h b/include/mbedtls/config.h
index 8a892d7..a58519b 100644
--- a/include/mbedtls/config.h
+++ b/include/mbedtls/config.h
@@ -2509,6 +2509,7 @@
 /* Entropy options */
 //#define MBEDTLS_ENTROPY_MAX_SOURCES                20 /**< Maximum number of sources supported */
 //#define MBEDTLS_ENTROPY_MAX_GATHER                128 /**< Maximum amount requested from entropy sources */
+//#define MBEDTLS_ENTROPY_MIN_HARDWARE               32 /**< Default minimum number of bytes required for the hardware entropy source mbedtls_hardware_poll() before entropy is released */
 
 /* Memory buffer allocator options */
 //#define MBEDTLS_MEMORY_ALIGN_MULTIPLE      4 /**< Align on multiples of this value */
diff --git a/include/mbedtls/entropy_poll.h b/include/mbedtls/entropy_poll.h
index 430e865..81258d5 100644
--- a/include/mbedtls/entropy_poll.h
+++ b/include/mbedtls/entropy_poll.h
@@ -41,7 +41,9 @@
 #define MBEDTLS_ENTROPY_MIN_PLATFORM     32     /**< Minimum for platform source    */
 #define MBEDTLS_ENTROPY_MIN_HAVEGE       32     /**< Minimum for HAVEGE             */
 #define MBEDTLS_ENTROPY_MIN_HARDCLOCK     4     /**< Minimum for mbedtls_timing_hardclock()        */
+#if !defined(MBEDTLS_ENTROPY_MIN_HARDWARE)
 #define MBEDTLS_ENTROPY_MIN_HARDWARE     32     /**< Minimum for the hardware source */
+#endif
 
 /**
  * \brief           Entropy poll callback that provides 0 entropy.