diff --git a/include/mbedtls/x509.h b/include/mbedtls/x509.h
index 8297910..f7987a9 100644
--- a/include/mbedtls/x509.h
+++ b/include/mbedtls/x509.h
@@ -320,7 +320,8 @@
                                mbedtls_x509_buf_raw const *b,
                                int (*check)( void *ctx,
                                              mbedtls_x509_buf *oid,
-                                             mbedtls_x509_buf *val ),
+                                             mbedtls_x509_buf *val,
+                                             int next_merged ),
                                void *check_ctx );
 int mbedtls_x509_memcasecmp( const void *s1, const void *s2,
                              size_t len1, size_t lend2 );