diff --git a/gui/syncthing/core/syncthingController.js b/gui/syncthing/core/syncthingController.js
index 9710880e..a104e881 100755
--- a/gui/syncthing/core/syncthingController.js
+++ b/gui/syncthing/core/syncthingController.js
@@ -1057,6 +1057,7 @@ angular.module('syncthing.core')
                 selectedDevices: {}
             };
             $scope.currentFolder.rescanIntervalS = 60;
+            $scope.currentFolder.minDiskFreePct = 1;
             $scope.currentFolder.order = "random";
             $scope.currentFolder.fileVersioningSelector = "none";
             $scope.currentFolder.trashcanClean = 0;
@@ -1077,6 +1078,7 @@ angular.module('syncthing.core')
                 id: folder,
                 selectedDevices: {},
                 rescanIntervalS: 60,
+                minDiskFreePct: 1,
                 fileVersioningSelector: "none",
                 trashcanClean: 0,
                 simpleKeep: 5,
diff --git a/gui/syncthing/folder/editFolderModalView.html b/gui/syncthing/folder/editFolderModalView.html
index b30f4c4c..0e5c336e 100644
--- a/gui/syncthing/folder/editFolderModalView.html
+++ b/gui/syncthing/folder/editFolderModalView.html
@@ -37,6 +37,13 @@
                   <span translate ng-if="!folderEditor.rescanIntervalS.$valid && folderEditor.rescanIntervalS.$dirty">The rescan interval must be a non-negative number of seconds.</span>
                 </p>
               </div>
+              <div class="form-group" ng-class="{'has-error': folderEditor.minDiskFreePct.$invalid && folderEditor.minDiskFreePct.$dirty}">
+                <label for="minDiskFreePct"><span translate>Minimum disk free percentage</span> (0-100)</label>
+                <input name="minDiskFreePct" id="minDiskFreePct" class="form-control" type="number" ng-model="currentFolder.minDiskFreePct" required min="0" max="100"></input>
+                <p class="help-block">
+                  <span translate ng-if="!folderEditor.minDiskFreePct.$valid && folderEditor.minDiskFreePct.$dirty">The minimum disk free percentage must be a non-negative number between 0 and 100 (inclusive).</span>
+                </p>
+              </div>
             </div>
           </div>
           <div class="row">