diff --git a/NEWS b/NEWS
index ffff548f..5d950ba7 100644
--- a/NEWS
+++ b/NEWS
@@ -31,6 +31,7 @@ This file documents the major additions and syntax changes between releases.
 	Check_radius now supports radiusclient-ng
 	Check_by_ssh now supports multiline output
 	IPv6 support can now be disabled using ./configure --without-ipv6
+	Fix check_ntp now honor ntp flags
 
 1.4.9 4th June 2006
 	Inclusion of contrib/check_cluster2 as check_cluster with some improvements
diff --git a/THANKS.in b/THANKS.in
index f6fe9417..cef2a77a 100644
--- a/THANKS.in
+++ b/THANKS.in
@@ -225,3 +225,4 @@ Christoph Schell
 Andrew Elwell
 Heiti Ernits
 Sebastien Guay
+MAtteo HCE Valsasna
diff --git a/plugins/check_ntp.c b/plugins/check_ntp.c
index 28c23d84..abd254c8 100644
--- a/plugins/check_ntp.c
+++ b/plugins/check_ntp.c
@@ -86,6 +86,7 @@ typedef struct {
 	double rtdelay;         /* converted from the ntp_message */
 	double rtdisp;          /* converted from the ntp_message */
 	double offset[AVG_NUM]; /* offsets from each response */
+	uint8_t flags;       /* byte with leapindicator,vers,mode. see macros */
 } ntp_server_results;
 
 /* this structure holds everything in an ntp control message as per rfc1305 */
@@ -302,6 +303,12 @@ int best_offset_server(const ntp_server_results *slist, int nservers){
 
 	/* for each server */
 	for(cserver=0; cserver<nservers; cserver++){
+		/* sort out servers with error flags */
+		if ( LI(slist[cserver].flags) != LI_NOWARNING ){
+			if (verbose) printf("discarding peer id %d: flags=%d\n", cserver, LI(slist[cserver].flags));
+			break;
+		}
+
 		/* compare it to each of the servers already in the candidate list */
 		for(i=0; i<csize; i++){
 			/* does it have an equal or better stratum? */
@@ -450,6 +457,7 @@ double offset_request(const char *host, int *status){
 				servers[i].rtdisp=NTP32asDOUBLE(req[i].rtdisp);
 				servers[i].rtdelay=NTP32asDOUBLE(req[i].rtdelay);
 				servers[i].waiting=0;
+				servers[i].flags=req[i].flags;
 				servers_readable--;
 				one_read = 1;
 				if(servers[i].num_responses==AVG_NUM) servers_completed++;
@@ -808,6 +816,7 @@ int main(int argc, char *argv[]){
 	}
 	if(offset_result==STATE_CRITICAL){
 		asprintf(&result_line, "%s %s", result_line, _("Offset unknown"));
+		asprintf(&perfdata_line, "");
 	} else {
 		if(offset_result==STATE_WARNING){
 			asprintf(&result_line, "%s %s", result_line, _("Unable to fully sample sync server"));