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-rw-r--r--lib/prefix.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/prefix.h b/lib/prefix.h
index b7fdc26369..b2f3b0592f 100644
--- a/lib/prefix.h
+++ b/lib/prefix.h
@@ -491,7 +491,7 @@ extern void masklen2ip(const int, struct in_addr *);
* special treatment for /31 according to RFC3021 section 3.3 */
extern in_addr_t ipv4_broadcast_addr(in_addr_t hostaddr, int masklen);
-extern int netmask_str2prefix_str(const char *, const char *, char *);
+extern int netmask_str2prefix_str(const char *, const char *, char *, size_t);
extern struct prefix_ipv6 *prefix_ipv6_new(void);
extern void prefix_ipv6_free(struct prefix_ipv6 **p);