Fix entropy thresholds
diff --git a/include/mbedtls/entropy_poll.h b/include/mbedtls/entropy_poll.h
index 34746f9..231042e 100644
--- a/include/mbedtls/entropy_poll.h
+++ b/include/mbedtls/entropy_poll.h
@@ -37,11 +37,11 @@
#endif
/*
- * Default thresholds for built-in sources
+ * Default thresholds for built-in sources, in bytes
*/
-#define MBEDTLS_ENTROPY_MIN_PLATFORM 128 /**< Minimum for platform source */
-#define MBEDTLS_ENTROPY_MIN_HAVEGE 128 /**< Minimum for HAVEGE */
-#define MBEDTLS_ENTROPY_MIN_HARDCLOCK 32 /**< Minimum for mbedtls_timing_hardclock() */
+#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_NO_PLATFORM_ENTROPY)
/**