diff --git a/yasnd.c b/yasnd.c
index f6771f0..e891326 100644
--- a/yasnd.c
+++ b/yasnd.c
@@ -102,6 +102,7 @@ void init()
 	{
 		hosts[i].hostname=cfg_getnstr(cfg,"hosts",i);
 		hosts[i].fail_count=0;
+		hosts[i].alert_sent=false;
 	}
 	// initialize gammu structures
 	gammu_init();
@@ -148,7 +149,10 @@ void loop_function()
 				// if host is alive - reset failure counter
 				// otherwise - increment it
 				if (WEXITSTATUS(pid_status) == 0)
+				{
 					hosts[i].fail_count=0;
+					hosts[i].alert_sent=false;
+				}
 				else
 					hosts[i].fail_count++;
 			}
@@ -156,13 +160,16 @@ void loop_function()
 	}
 	for (int i=0;i<hosts_count;i++)
 	{
-		if (hosts[i].fail_count>0)
+		if (hosts[i].fail_count>0 && !hosts[i].alert_sent)
 		{
 			char message[100];
 			sprintf(message,"Host %s does not answer",hosts[i].hostname);
 			log_debug(message,DEBUG_BASE);
 			if (sms_send_enable)
 				gammu_send_sms(message);
+			// set alert flag to prevent sending more than 1 message
+			// for unreachable host
+			hosts[i].alert_sent=true;
 		}
 	}
 }
diff --git a/yasnd.h b/yasnd.h
index 1bf3fac..14bced8 100644
--- a/yasnd.h
+++ b/yasnd.h
@@ -19,6 +19,7 @@ typedef struct {
 	char* hostname; // address of host
 	pid_t helper_pid; // pid of helper('pinger') child process
 	int fail_count; // how many times in a row host was unreachable
+	bool alert_sent; // variable, that changed when host goes online/offline
 } host_decl;
 
 // External variables