diff --git a/lib/methods/clusterzonechecktask.cpp b/lib/methods/clusterzonechecktask.cpp
index 8cd788ad1..38c8a718d 100644
--- a/lib/methods/clusterzonechecktask.cpp
+++ b/lib/methods/clusterzonechecktask.cpp
@@ -81,28 +81,28 @@ void ClusterZoneCheckTask::ScriptFunc(const Checkable::Ptr& checkable, const Che
 	}
 
 	bool connected = false;
-	double lag = 0;
+	double zoneLag = 0;
 
 	BOOST_FOREACH(const Endpoint::Ptr& endpoint, zone->GetEndpoints()) {
-		double eplag = Utility::GetTime() - endpoint->GetRemoteLogPosition();
-
 		if (endpoint->IsConnected())
 			connected = true;
 
-		if ((endpoint->GetSyncing() || !endpoint->IsConnected()) && eplag > lag)
-			lag = eplag;
+		double eplag = ApiListener::CalculateZoneLag(endpoint);
+
+		if (eplag > 0 && eplag > zoneLag)
+			zoneLag = eplag;
 	}
 
 	if (!connected) {
 		cr->SetState(ServiceCritical);
-		cr->SetOutput("Zone '" + zoneName + "' is not connected. Log lag: " + Utility::FormatDuration(lag));
+		cr->SetOutput("Zone '" + zoneName + "' is not connected. Log lag: " + Utility::FormatDuration(zoneLag));
 	} else {
 		cr->SetState(ServiceOK);
-		cr->SetOutput("Zone '" + zoneName + "' is connected. Log lag: " + Utility::FormatDuration(lag));
+		cr->SetOutput("Zone '" + zoneName + "' is connected. Log lag: " + Utility::FormatDuration(zoneLag));
 	}
 
 	Array::Ptr perfdata = new Array();
-	perfdata->Add(new PerfdataValue("slave_lag", lag));
+	perfdata->Add(new PerfdataValue("slave_lag", zoneLag));
 	cr->SetPerformanceData(perfdata);
 
 	checkable->ProcessCheckResult(cr);
diff --git a/lib/remote/apilistener.cpp b/lib/remote/apilistener.cpp
index 101efccfe..c2173cfaa 100644
--- a/lib/remote/apilistener.cpp
+++ b/lib/remote/apilistener.cpp
@@ -836,6 +836,17 @@ std::pair<Dictionary::Ptr, Dictionary::Ptr> ApiListener::GetStatus(void)
 	return std::make_pair(status, perfdata);
 }
 
+double ApiListener::CalculateZoneLag(const Endpoint::Ptr& endpoint)
+{
+	double remoteLogPosition = endpoint->GetRemoteLogPosition();
+	double eplag = Utility::GetTime() - remoteLogPosition;
+
+	if ((endpoint->GetSyncing() || !endpoint->IsConnected()) && remoteLogPosition != 0)
+		return eplag;
+
+	return 0;
+}
+
 void ApiListener::AddAnonymousClient(const ApiClient::Ptr& aclient)
 {
 	ObjectLock olock(this);
diff --git a/lib/remote/apilistener.hpp b/lib/remote/apilistener.hpp
index 71a33e578..74e39b534 100644
--- a/lib/remote/apilistener.hpp
+++ b/lib/remote/apilistener.hpp
@@ -68,9 +68,12 @@ public:
 	void RemoveAnonymousClient(const ApiClient::Ptr& aclient);
 	std::set<ApiClient::Ptr> GetAnonymousClients(void) const;
 
+	static double CalculateZoneLag(const Endpoint::Ptr& endpoint);
+
 	static Value ConfigUpdateHandler(const MessageOrigin& origin, const Dictionary::Ptr& params);
 
 	static Value HelloAPIHandler(const MessageOrigin& origin, const Dictionary::Ptr& params);
+
 protected:
 	virtual void OnConfigLoaded(void);
 	virtual void OnAllConfigLoaded(void);