diff --git a/servers/slapd/filter.c b/servers/slapd/filter.c
index 8678f48b64..70aa4b5e28 100644
--- a/servers/slapd/filter.c
+++ b/servers/slapd/filter.c
@@ -702,6 +702,7 @@ filter_free( Filter *f )
 		if ( f->f_sub_final != NULL ) {
 			ber_bvfree( f->f_sub_final );
 		}
+		ch_free( f->f_sub );
 		break;
 
 	case LDAP_FILTER_AND: