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 src/lib/active_directory.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/lib/active_directory.c b/src/lib/active_directory.c
index 1eacf5f..d4e1ca6 100644
--- a/src/lib/active_directory.c
+++ b/src/lib/active_directory.c
@@ -172,8 +172,8 @@ char *dn2domain(char *dn) {
 	exp_dn=ldap_explode_dn(dn, 0);
 	for(i=0; exp_dn[i]!=NULL; i++) {
 		if(!strncasecmp("dc=", exp_dn[i], 3)) {
-			strncat(dc, exp_dn[i]+3, 1024);
-			strncat(dc, ".", 1024);
+			strncat(dc, exp_dn[i]+3, 1024 - 1);
+			strncat(dc, ".", 1024 - 1);
 		}
 	}
 	ldap_value_free(exp_dn);