diff --git a/src/Umbraco.Web.UI.Client/src/views/common/infiniteeditors/blockeditor/blockeditor.controller.js b/src/Umbraco.Web.UI.Client/src/views/common/infiniteeditors/blockeditor/blockeditor.controller.js
index f515cbb4ba..4d79ecb7b4 100644
--- a/src/Umbraco.Web.UI.Client/src/views/common/infiniteeditors/blockeditor/blockeditor.controller.js
+++ b/src/Umbraco.Web.UI.Client/src/views/common/infiniteeditors/blockeditor/blockeditor.controller.js
@@ -1,6 +1,6 @@
 angular.module("umbraco")
     .controller("Umbraco.Editors.BlockEditorController",
-        function ($scope, localizationService, formHelper) {
+        function ($scope, localizationService, formHelper, overlayService) {
             var vm = this;
 
             vm.model = $scope.model;
@@ -67,6 +67,29 @@ angular.module("umbraco")
                     // * It would have a 'commit' method to commit the removed errors - which we would call in the formHelper.submitForm when it's successful
                     // * It would have a 'rollback' method to reset the removed errors - which we would call here
 
+
+                    if (vm.blockForm.$dirty === true) {
+                        localizationService.localizeMany(["prompt_discardChanges", "blockEditor_blockHasChanges"]).then(function (localizations) {
+                            const confirm = {
+                                title: localizations[0],
+                                view: "default",
+                                content: localizations[1],
+                                submitButtonLabelKey: "general_discard",
+                                submitButtonStyle: "danger",
+                                closeButtonLabelKey: "general_cancel",
+                                submit: function () {
+                                    overlayService.close();
+                                    vm.model.close(vm.model);
+                                },
+                                close: function () {
+                                    overlayService.close();
+                                }
+                            };
+                            overlayService.open(confirm);
+                        });
+
+                        return;
+                    }
                     // TODO: check if content/settings has changed and ask user if they are sure.
                     vm.model.close(vm.model);
                 }
diff --git a/src/Umbraco.Web.UI/Umbraco/config/lang/da.xml b/src/Umbraco.Web.UI/Umbraco/config/lang/da.xml
index e3d456dea7..a7957c5afd 100644
--- a/src/Umbraco.Web.UI/Umbraco/config/lang/da.xml
+++ b/src/Umbraco.Web.UI/Umbraco/config/lang/da.xml
@@ -647,6 +647,7 @@
     <key alias="design">Design</key>
     <key alias="dictionary">Ordbog</key>
     <key alias="dimensions">Dimensioner</key>
+    <key alias="discard">Discard</key>
     <key alias="down">Ned</key>
     <key alias="download">Hent</key>
     <key alias="edit">Rediger</key>
@@ -1851,6 +1852,7 @@ Mange hilsner fra Umbraco robotten
     <key alias="tabBlockSettings">Indstillinger</key>
     <key alias="headlineAdvanced">Avanceret</key>
     <key alias="forceHideContentEditor">Skjuld indholds editoren</key>
+    <key alias="blockHasChanges">Du har lavet ændringer til dette indhold. Er du sikker på at du vil kassere dem?</key>
   </area>
 
 </language>
diff --git a/src/Umbraco.Web.UI/Umbraco/config/lang/en.xml b/src/Umbraco.Web.UI/Umbraco/config/lang/en.xml
index 8355c36bd1..d72ee33d6c 100644
--- a/src/Umbraco.Web.UI/Umbraco/config/lang/en.xml
+++ b/src/Umbraco.Web.UI/Umbraco/config/lang/en.xml
@@ -675,6 +675,7 @@
     <key alias="design">Design</key>
     <key alias="dictionary">Dictionary</key>
     <key alias="dimensions">Dimensions</key>
+    <key alias="discard">Discard</key>
     <key alias="down">Down</key>
     <key alias="download">Download</key>
     <key alias="edit">Edit</key>
@@ -2467,6 +2468,7 @@ To manage your website, simply open the Umbraco back office and start adding con
     <key alias="tabBlockSettings">Settings</key>
     <key alias="headlineAdvanced">Advanced</key>
     <key alias="forceHideContentEditor">Force hide content editor</key>
+    <key alias="blockHasChanges">You have made changes to this content. Are you sure you want to discard them?</key>
   </area>
   <area alias="contentTemplatesDashboard">
     <key alias="whatHeadline">What are Content Templates?</key>
diff --git a/src/Umbraco.Web.UI/Umbraco/config/lang/en_us.xml b/src/Umbraco.Web.UI/Umbraco/config/lang/en_us.xml
index fccd11a5aa..cb31695268 100644
--- a/src/Umbraco.Web.UI/Umbraco/config/lang/en_us.xml
+++ b/src/Umbraco.Web.UI/Umbraco/config/lang/en_us.xml
@@ -682,6 +682,7 @@
     <key alias="design">Design</key>
     <key alias="dictionary">Dictionary</key>
     <key alias="dimensions">Dimensions</key>
+    <key alias="discard">Discard</key>
     <key alias="down">Down</key>
     <key alias="download">Download</key>
     <key alias="edit">Edit</key>
@@ -2487,6 +2488,7 @@ To manage your website, simply open the Umbraco back office and start adding con
     <key alias="tabBlockSettings">Settings</key>
     <key alias="headlineAdvanced">Advanced</key>
     <key alias="forceHideContentEditor">Force hide content editor</key>
+    <key alias="blockHasChanges">You have made changes to this content. Are you sure you want to discard them?</key>
   </area>
   <area alias="contentTemplatesDashboard">
     <key alias="whatHeadline">What are Content Templates?</key>