diff --git a/src/nss/crypto.c b/src/nss/crypto.c
index 9171313c5..429d209f3 100644
--- a/src/nss/crypto.c
+++ b/src/nss/crypto.c
@@ -412,7 +412,7 @@ xmlSecNssKeysMngrInit(xmlSecKeysMngrPtr mngr) {
  * Returns: internal key slot and initializes it if needed.
  */
 PK11SlotInfo *
-xmlSecNssGetInternalKeySlot()
+xmlSecNssGetInternalKeySlot(void)
 {
     PK11SlotInfo *slot = NULL;
     SECStatus rv;