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-rw-r--r--isisd/isis_pdu.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/isisd/isis_pdu.c b/isisd/isis_pdu.c
index 4311a905..a2ab0649 100644
--- a/isisd/isis_pdu.c
+++ b/isisd/isis_pdu.c
@@ -64,7 +64,7 @@ extern struct isis *isis;
#endif /* PNBBY */
/* Utility mask array. */
-static u_char maskbit[] = {
+static const u_char maskbit[] = {
0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff
};