diff --git a/include/mbedtls/hmac_drbg.h b/include/mbedtls/hmac_drbg.h
index 1ab3422..3f3d630 100644
--- a/include/mbedtls/hmac_drbg.h
+++ b/include/mbedtls/hmac_drbg.h
@@ -294,8 +294,8 @@
  * \return              \c 0 on success, or an error from the underlying
  *                      hash calculation.
  */
-int mbedtls_hmac_drbg_update_ret( mbedtls_hmac_drbg_context *ctx,
-                       const unsigned char *additional, size_t add_len );
+int mbedtls_hmac_drbg_update( mbedtls_hmac_drbg_context *ctx,
+                              const unsigned char *additional, size_t add_len );
 
 /**
  * \brief               This function reseeds the HMAC_DRBG context, that is