diff --git a/gns3/dialogs/preferences_dialog.py b/gns3/dialogs/preferences_dialog.py
index b54cd335d..14b218bbc 100644
--- a/gns3/dialogs/preferences_dialog.py
+++ b/gns3/dialogs/preferences_dialog.py
@@ -128,7 +128,7 @@ def _watchForChanges(self, preferences_page):
 
         # Class name, changed signal
         widget_to_watch = {
-            #QtWidgets.QLineEdit: "textChanged",
+            QtWidgets.QLineEdit: "textChanged",
             QtWidgets.QPlainTextEdit: "textChanged",
             # QtWidgets.QTreeWidget: "itemChanged",
             QtWidgets.QComboBox: "currentIndexChanged",
diff --git a/gns3/modules/iou/pages/iou_preferences_page.py b/gns3/modules/iou/pages/iou_preferences_page.py
index 148e88a93..240f66404 100644
--- a/gns3/modules/iou/pages/iou_preferences_page.py
+++ b/gns3/modules/iou/pages/iou_preferences_page.py
@@ -99,7 +99,9 @@ def _populateWidgets(self, settings):
         """
 
         if settings["iourc_content"]:
+            self.IOULicenceTextEdit.blockSignals(True)
             self.IOULicenceTextEdit.setPlainText(settings["iourc_content"])
+            self.IOULicenceTextEdit.blockSignals(False)
         self.uiLicensecheckBox.setChecked(settings["license_check"])
 
     def loadPreferences(self):