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-rw-r--r--inet/if_index.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/inet/if_index.c b/inet/if_index.c
index b85a93f9a4..0442633142 100644
--- a/inet/if_index.c
+++ b/inet/if_index.c
@@ -31,7 +31,7 @@ libc_hidden_weak (if_nametoindex)
 stub_warning (if_nametoindex)
 
 char *
-__if_indextoname (unsigned int ifindex, char *ifname)
+__if_indextoname (unsigned int ifindex, char ifname[IF_NAMESIZE])
 {
   __set_errno (ENOSYS);
   return NULL;