diff --git a/include/polarssl/x509_crt.h b/include/polarssl/x509_crt.h
index 55042ec..6378191 100644
--- a/include/polarssl/x509_crt.h
+++ b/include/polarssl/x509_crt.h
@@ -255,6 +255,13 @@
 #endif /* POLARSSL_X509_CRL_PARSE_C */
 
 /**
+ * \brief          Initialize a certificate (chain)
+ *
+ * \param crt      Certificate chain to initialize
+ */
+void x509_crt_init( x509_cert *crt );
+
+/**
  * \brief          Unallocate all certificate data
  *
  * \param crt      Certificate chain to free