diff --git a/ChangeLog b/ChangeLog
index e8fa013..32f930b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -3,6 +3,8 @@
 = mbed TLS 2.1.x branch released xxxx-xx-xx
 
 Bugfix
+   * Fix redefinition of macro ssl_set_bio to undefined symbol
+     mbedtls_ssl_set_bio_timeout in compat-1.3.h. #673
    * Fixed multiple buffer overreads in mbedtls_pem_read_buffer() when parsing
      the input string in PEM format to extract the different components. Found
      by Eyal Itkin.
diff --git a/include/mbedtls/compat-1.3.h b/include/mbedtls/compat-1.3.h
index 27abbd9..af51b5f 100644
--- a/include/mbedtls/compat-1.3.h
+++ b/include/mbedtls/compat-1.3.h
@@ -2453,7 +2453,6 @@
 #define ssl_set_arc4_support mbedtls_ssl_conf_arc4_support
 #define ssl_set_authmode mbedtls_ssl_conf_authmode
 #define ssl_set_bio mbedtls_ssl_set_bio
-#define ssl_set_bio mbedtls_ssl_set_bio_timeout
 #define ssl_set_ca_chain mbedtls_ssl_conf_ca_chain
 #define ssl_set_cbc_record_splitting mbedtls_ssl_conf_cbc_record_splitting
 #define ssl_set_ciphersuites mbedtls_ssl_conf_ciphersuites
diff --git a/scripts/data_files/rename-1.3-2.0.txt b/scripts/data_files/rename-1.3-2.0.txt
index 397f6be..cb3381a 100644
--- a/scripts/data_files/rename-1.3-2.0.txt
+++ b/scripts/data_files/rename-1.3-2.0.txt
@@ -1996,7 +1996,6 @@
 ssl_set_arc4_support mbedtls_ssl_conf_arc4_support
 ssl_set_authmode mbedtls_ssl_conf_authmode
 ssl_set_bio mbedtls_ssl_set_bio
-ssl_set_bio_timeout mbedtls_ssl_set_bio_timeout
 ssl_set_ca_chain mbedtls_ssl_conf_ca_chain
 ssl_set_cbc_record_splitting mbedtls_ssl_conf_cbc_record_splitting
 ssl_set_ciphersuites mbedtls_ssl_conf_ciphersuites