diff --git a/applets/systemmonitor/common/contents/ui/Applet.qml b/applets/systemmonitor/common/contents/ui/Applet.qml
--- a/applets/systemmonitor/common/contents/ui/Applet.qml
+++ b/applets/systemmonitor/common/contents/ui/Applet.qml
@@ -29,6 +29,7 @@
     id: rootItem
 
     signal sourceAdded(string source)
+    signal sourceRemoved(string source)
     property Component delegate
 
     width: units.gridUnit * 10
@@ -66,6 +67,22 @@
             "dataSource": smSource});
     }
 
+    function removeSource(source1, friendlyName1, source2, friendlyName2) {
+        var found = false;
+        for (var i = 0; i < sourcesModel.count; ++i) {
+            var obj = sourcesModel.get(i);
+            if (obj.source1 == encodeURIComponent(source1) &&
+                obj.source2 == encodeURIComponent(source2)) {
+                sourcesModel.remove(i);
+                if (source2) {
+                    smSource.disconnectSource(source2);
+                }
+                smSource.disconnectSource(source1);
+                break;
+            }
+        }
+    }
+
     ListModel {
         id: sourcesModel
     }
@@ -96,6 +113,7 @@
                 }
             }
             smSource.disconnectSource(source);
+            rootItem.sourceRemoved(source);
         }
     }
     Connections {
diff --git a/applets/systemmonitor/net/contents/ui/net.qml b/applets/systemmonitor/net/contents/ui/net.qml
--- a/applets/systemmonitor/net/contents/ui/net.qml
+++ b/applets/systemmonitor/net/contents/ui/net.qml
@@ -39,6 +39,17 @@
         }
     }
 
+    onSourceRemoved: {
+        if (source.indexOf("network/interfaces/lo/") !== -1) {
+            return;
+        }
+        var match = source.match(/^network\/interfaces\/(\w+)\/transmitter\/data$/);
+        if (match) {
+            var rxSource = "network/interfaces/" + match[1] + "/receiver/data";
+            root.removeSource(source, match[1], rxSource, match[1]);
+        }
+    }
+
     delegate: DoublePlotter {
         function formatData(data) {
             var value = data.value * 1024 * 8