diff --git a/include/mbedtls/x509_csr.h b/include/mbedtls/x509_csr.h
index 0082ada..7ae7d22 100644
--- a/include/mbedtls/x509_csr.h
+++ b/include/mbedtls/x509_csr.h
@@ -198,7 +198,7 @@
  * \param ctx       CSR context to use
  * \param key_usage key usage flags to set
  *
- * \return          0 if successful, or MBEDTLS_ERR_X509_MALLOC_FAILED
+ * \return          0 if successful, or MBEDTLS_ERR_X509_ALLOC_FAILED
  */
 int mbedtls_x509write_csr_set_key_usage( mbedtls_x509write_csr *ctx, unsigned char key_usage );
 
@@ -209,7 +209,7 @@
  * \param ctx           CSR context to use
  * \param ns_cert_type  Netscape Cert Type flags to set
  *
- * \return          0 if successful, or MBEDTLS_ERR_X509_MALLOC_FAILED
+ * \return          0 if successful, or MBEDTLS_ERR_X509_ALLOC_FAILED
  */
 int mbedtls_x509write_csr_set_ns_cert_type( mbedtls_x509write_csr *ctx,
                                     unsigned char ns_cert_type );
@@ -224,7 +224,7 @@
  * \param val       value of the extension OCTET STRING
  * \param val_len   length of the value data
  *
- * \return          0 if successful, or a MBEDTLS_ERR_X509_MALLOC_FAILED
+ * \return          0 if successful, or a MBEDTLS_ERR_X509_ALLOC_FAILED
  */
 int mbedtls_x509write_csr_set_extension( mbedtls_x509write_csr *ctx,
                                  const char *oid, size_t oid_len,