Use MBEDTLS_ namespace for internal CID length constant
diff --git a/include/mbedtls/ssl_internal.h b/include/mbedtls/ssl_internal.h
index 01458c5..866d7f8 100644
--- a/include/mbedtls/ssl_internal.h
+++ b/include/mbedtls/ssl_internal.h
@@ -646,9 +646,9 @@
  *
  */
 #if MBEDTLS_SSL_CID_OUT_LEN_MAX > MBEDTLS_SSL_CID_IN_LEN_MAX
-#define SSL_CID_LEN_MAX MBEDTLS_SSL_CID_OUT_LEN_MAX
+#define MBEDTLS_SSL_CID_LEN_MAX MBEDTLS_SSL_CID_OUT_LEN_MAX
 #else
-#define SSL_CID_LEN_MAX MBEDTLS_SSL_CID_IN_LEN_MAX
+#define MBEDTLS_SSL_CID_LEN_MAX MBEDTLS_SSL_CID_IN_LEN_MAX
 #endif
 
 typedef struct
@@ -664,7 +664,7 @@
 
 #if defined(MBEDTLS_SSL_CID)
     uint8_t cid_len;
-    unsigned char cid[ SSL_CID_LEN_MAX ];
+    unsigned char cid[ MBEDTLS_SSL_CID_LEN_MAX ];
 #endif /* MBEDTLS_SSL_CID */
 
 } mbedtls_record;