diff --git a/wolfssl/wolfcrypt/settings.h b/wolfssl/wolfcrypt/settings.h
index fa6aaa0e9..57c404a54 100644
--- a/wolfssl/wolfcrypt/settings.h
+++ b/wolfssl/wolfcrypt/settings.h
@@ -108,6 +108,9 @@
 /* Uncomment next line if using Max Strength build */
 /* #define WOLFSSL_MAX_STRENGTH */
 
+/* Uncomment next line if building for VxWorks */
+/* #define WOLFSSL_VXWORKS */
+
 #include <wolfssl/wolfcrypt/visibility.h>
 
 #ifdef WOLFSSL_USER_SETTINGS
@@ -273,6 +276,12 @@
 #endif
 
 
+#ifdef WOLFSSL_VXWORKS
+    #define NO_DEV_RANDOM
+    #define NO_WRITEV
+#endif
+
+
 /* Micrium will use Visual Studio for compilation but not the Win32 API */
 #if defined(_WIN32) && !defined(MICRIUM) && !defined(FREERTOS) \
         && !defined(EBSNET) && !defined(WOLFSSL_EROAD)