diff --git a/libs/netpgp/include/netpgp/keyring.h b/libs/netpgp/include/netpgp/keyring.h
index 9984dc57..c046093e 100644
--- a/libs/netpgp/include/netpgp/keyring.h
+++ b/libs/netpgp/include/netpgp/keyring.h
@@ -138,7 +138,7 @@ unsigned pgp_update_userid(
         pgp_key_t *key,
         const uint8_t *userid,
         const pgp_subpacket_t *sigpkt,
-        pgp_sig_info_t *siginfo);
+        const pgp_sig_info_t *siginfo);
 
 // pgp_subpacket_t *pgp_add_subpacket(pgp_key_t *,
 // 						const pgp_subpacket_t *);
diff --git a/libs/netpgp/src/keyring.c b/libs/netpgp/src/keyring.c
index f8ccf7b3..9dc2b630 100644
--- a/libs/netpgp/src/keyring.c
+++ b/libs/netpgp/src/keyring.c
@@ -1507,7 +1507,7 @@ unsigned pgp_update_userid(
         pgp_key_t *key,
         const uint8_t *userid,
         const pgp_subpacket_t *sigpkt,
-        pgp_sig_info_t *siginfo)
+        const pgp_sig_info_t *siginfo)
 {
 	    unsigned    	 	 uididx = 0;
         unsigned    	 	 uidsigidx = 0;