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-rw-r--r--lib/sockunion.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/sockunion.c b/lib/sockunion.c
index 5dcf72563a..3cbb59cc60 100644
--- a/lib/sockunion.c
+++ b/lib/sockunion.c
@@ -552,7 +552,7 @@ sockopt_v6only (int family, int sock)
/* If same family and same prefix return 1. */
int
-sockunion_same (union sockunion *su1, union sockunion *su2)
+sockunion_same (const union sockunion *su1, const union sockunion *su2)
{
int ret = 0;