diff --git a/include/mbedtls/entropy.h b/include/mbedtls/entropy.h
index c9bd961..fed0494 100644
--- a/include/mbedtls/entropy.h
+++ b/include/mbedtls/entropy.h
@@ -134,6 +134,9 @@
 #if defined(MBEDTLS_THREADING_C)
     mbedtls_threading_mutex_t mutex;    /*!< mutex                  */
 #endif
+#if defined(MBEDTLS_ENTROPY_NV_SEED)
+    int initial_entropy_run;
+#endif
 }
 mbedtls_entropy_context;