diff --git a/library/ssl_misc.h b/library/ssl_misc.h
index 50aee6f..6b0bf57 100644
--- a/library/ssl_misc.h
+++ b/library/ssl_misc.h
@@ -1435,10 +1435,10 @@
 /*
  * Write TLS1.3 Signature Algorithm extesion
  */
-int mbedtls_ssl_tls13_write_signature_algorithms_ext( mbedtls_ssl_context *ssl,
-                                                      unsigned char *buf,
-                                                      unsigned char *end,
-                                                      size_t *olen);
+int mbedtls_ssl_tls13_write_sig_alg_ext( mbedtls_ssl_context *ssl,
+                                         unsigned char *buf,
+                                         unsigned char *end,
+                                         size_t *olen);
 #endif /* MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED */
 
 #endif /* MBEDTLS_SSL_PROTO_TLS1_3_EXPERIMENTAL */
diff --git a/library/ssl_tls13_client.c b/library/ssl_tls13_client.c
index ef9836d..dce83f4 100644
--- a/library/ssl_tls13_client.c
+++ b/library/ssl_tls13_client.c
@@ -311,8 +311,7 @@
 
     /* The supported_signature_algorithms extension is REQUIRED for
      * certificate authenticated ciphersuites. */
-    ret = mbedtls_ssl_tls13_write_signature_algorithms_ext( ssl, buf,
-                                                            end, &cur_ext_len );
+    ret = mbedtls_ssl_tls13_write_sig_alg_ext( ssl, buf, end, &cur_ext_len );
     if( ret != 0 )
         return( ret );
 
diff --git a/library/ssl_tls13_generic.c b/library/ssl_tls13_generic.c
index 4b087ba..1713d4c 100644
--- a/library/ssl_tls13_generic.c
+++ b/library/ssl_tls13_generic.c
@@ -73,7 +73,7 @@
 #if defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED)
 
 /*
- * mbedtls_ssl_tls13_write_signature_algorithms_ext( )
+ * mbedtls_ssl_tls13_write_sig_alg_ext( )
  *
  * enum {
  *    ....
@@ -90,11 +90,10 @@
  * Only if we handle at least one key exchange that needs signatures.
  */
 
-int mbedtls_ssl_tls13_write_signature_algorithms_ext( 
-    mbedtls_ssl_context *ssl,
-    unsigned char *buf,
-    unsigned char *end,
-    size_t *olen )
+int mbedtls_ssl_tls13_write_sig_alg_ext( mbedtls_ssl_context *ssl,
+                                         unsigned char *buf,
+                                         unsigned char *end,
+                                         size_t *olen )
 {
     ((void) ssl);
     ((void) buf);