diff --git a/src/io.c b/src/io.c
index c78883836..d7065df9e 100644
--- a/src/io.c
+++ b/src/io.c
@@ -61,18 +61,16 @@
         #include <rtcs.h>
     #elif defined(FREESCALE_KSDK_MQX)
         #include <rtcs.h>
-    #elif defined(WOLFSSL_MDK_ARM)
-        #if defined(WOLFSSL_MDK5)
+    #elif defined(WOLFSSL_MDK_ARM) || defined(WOLFSSL_KEIL_TCP_NET)
+        #if defined(WOLFSSL_MDK5) || defined(WOLFSSL_KEIL_TCP_NET)
             #include "cmsis_os.h"
-            #include "rl_fs.h" 
-            #include "rl_net.h" 
+            #include "rl_net.h"
         #else
             #include <rtl.h>
         #endif
-        #undef RNG
-        #include "WOLFSSL_MDK_ARM.h"
-        #undef RNG
-        #define RNG wolfSSL_RNG 
+        static int errno;
+        #define SOCKET_T int
+        #include "rl_net.h"
         /* for avoiding name conflict in "stm32f2xx.h" */
         static int errno;
     #elif defined(WOLFSSL_TIRTOS)
@@ -157,8 +155,8 @@
         #define SOCKET_ECONNREFUSED NIO_ECONNREFUSED
         #define SOCKET_ECONNABORTED NIO_ECONNABORTED
     #endif
-#elif defined(WOLFSSL_MDK_ARM)
-    #if defined(WOLFSSL_MDK5)
+#elif defined(WOLFSSL_MDK_ARM)|| defined(WOLFSSL_KEIL_TCP_NET)
+    #if defined(WOLFSSL_MDK5)|| defined(WOLFSSL_KEIL_TCP_NET)
         #define SOCKET_EWOULDBLOCK BSD_ERROR_WOULDBLOCK
         #define SOCKET_EAGAIN      BSD_ERROR_LOCKED
         #define SOCKET_ECONNRESET  BSD_ERROR_CLOSED
diff --git a/src/ssl.c b/src/ssl.c
index fdbe8ce5d..60b199944 100644
--- a/src/ssl.c
+++ b/src/ssl.c
@@ -3492,13 +3492,6 @@ int wolfSSL_CTX_SetOCSP_Cb(WOLFSSL_CTX* ctx, CbOCSPIO ioCb,
 
 #ifndef NO_FILESYSTEM
 
-    #if defined(WOLFSSL_MDK_ARM)
-        extern FILE * wolfSSL_fopen(const char *name, const char *mode) ;
-        #define XFOPEN     wolfSSL_fopen
-    #else
-        #define XFOPEN     fopen
-    #endif
-
 /* process a file with name fname into ctx of format and type
    userChain specifies a user certificate chain to pass during handshake */
 int ProcessFile(WOLFSSL_CTX* ctx, const char* fname, int format, int type,
@@ -7578,7 +7571,7 @@ int wolfSSL_set_compression(WOLFSSL* ssl)
 
 #ifdef USE_WINDOWS_API
     #define CloseSocket(s) closesocket(s)
-#elif defined(WOLFSSL_MDK_ARM)
+#elif defined(WOLFSSL_MDK_ARM)  || defined(WOLFSSL_KEIL_TCP_NET)
     #define CloseSocket(s) closesocket(s)
     extern int closesocket(int) ;
 #else