diff --git a/include/polarssl/x509_csr.h b/include/polarssl/x509_csr.h
index af3f226..28ddeda 100644
--- a/include/polarssl/x509_csr.h
+++ b/include/polarssl/x509_csr.h
@@ -66,8 +66,9 @@
     x509_buf sig_oid;
     x509_buf sig;
     md_type_t sig_md;       /**< Internal representation of the MD algorithm of the signature algorithm, e.g. POLARSSL_MD_SHA256 */
-    pk_type_t sig_pk        /**< Internal representation of the Public Key algorithm of the signature algorithm, e.g. POLARSSL_PK_RSA */;
+    pk_type_t sig_pk;       /**< Internal representation of the Public Key algorithm of the signature algorithm, e.g. POLARSSL_PK_RSA */
 #if defined(POLARSSL_RSASSA_PSS_CERTIFICATES)
+    void *sig_opts;             /**< Signature options to be passed to pk_verify_ext(), eg for RSASSA-PSS */
     x509_buf sig_params;        /**< Parameters for the signature algorithm */
 #endif
 }