diff --git a/app/src/main/java/info/nightscout/androidaps/plugins/InsulinOrefCurves/InsulinOrefBasePlugin.java b/app/src/main/java/info/nightscout/androidaps/plugins/InsulinOrefCurves/InsulinOrefBasePlugin.java
index e57b068620..10dfd5dce5 100644
--- a/app/src/main/java/info/nightscout/androidaps/plugins/InsulinOrefCurves/InsulinOrefBasePlugin.java
+++ b/app/src/main/java/info/nightscout/androidaps/plugins/InsulinOrefCurves/InsulinOrefBasePlugin.java
@@ -7,6 +7,8 @@ import info.nightscout.androidaps.data.Iob;
 import info.nightscout.androidaps.db.Treatment;
 import info.nightscout.androidaps.interfaces.InsulinInterface;
 import info.nightscout.androidaps.interfaces.PluginBase;
+import info.nightscout.androidaps.plugins.Overview.Notification;
+import info.nightscout.androidaps.plugins.Overview.events.EventNewNotification;
 
 /**
  * Created by adrian on 13.08.2017.
@@ -16,6 +18,8 @@ public abstract class InsulinOrefBasePlugin implements PluginBase, InsulinInterf
 
     public static double MIN_DIA = 5;
 
+    long lastWarned = 0;
+
     @Override
     public int getType() {
         return INSULIN;
@@ -44,7 +48,16 @@ public abstract class InsulinOrefBasePlugin implements PluginBase, InsulinInterf
     @Override
     public double getDia() {
         double dia = getUserDefinedDia();
-        return Math.max(MIN_DIA, dia);
+        if(dia >= MIN_DIA){
+            return dia;
+        } else {
+            if((System.currentTimeMillis() - lastWarned) > 60*1000) {
+                lastWarned = System.currentTimeMillis();
+                Notification notification = new Notification(Notification.SHORT_DIA, String.format(MainApp.sResources.getString(R.string.dia_too_short), dia, MIN_DIA), Notification.URGENT);
+                MainApp.bus().post(new EventNewNotification(notification));
+            }
+            return MIN_DIA;
+        }
     }
 
     public double getUserDefinedDia() {
diff --git a/app/src/main/java/info/nightscout/androidaps/plugins/Overview/Notification.java b/app/src/main/java/info/nightscout/androidaps/plugins/Overview/Notification.java
index 9f35599b36..d3db3c2902 100644
--- a/app/src/main/java/info/nightscout/androidaps/plugins/Overview/Notification.java
+++ b/app/src/main/java/info/nightscout/androidaps/plugins/Overview/Notification.java
@@ -47,6 +47,8 @@ public class Notification {
     public static final int NSANNOUNCEMENT = 18;
     public static final int NSALARM = 19;
     public static final int NSURGENTALARM = 20;
+    public static final int SHORT_DIA = 21;
+
 
     public int id;
     public Date date;