diff --git a/lib/libpam/modules/pam_unix/pam_unix.c b/lib/libpam/modules/pam_unix/pam_unix.c
--- a/lib/libpam/modules/pam_unix/pam_unix.c
+++ b/lib/libpam/modules/pam_unix/pam_unix.c
@@ -76,7 +76,7 @@
 #define	LOCKED_PREFIX		"*LOCKED*"
 #define	LOCKED_PREFIX_LEN	(sizeof(LOCKED_PREFIX) - 1)
 
-static void makesalt(char []);
+static void makesalt(char [SALTSIZE + 1]);
 
 static char password_hash[] =		PASSWORD_HASH;