diff --git a/src/Makefile b/src/Makefile
index 324e755..c703c0c 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -28,6 +28,7 @@ JSSRC=					\
 	form/BondModeSelector.js	\
 	form/NetworkSelector.js		\
 	form/RealmComboBox.js		\
+	form/PruneKeepField.js		\
 	form/RoleSelector.js		\
 	form/DiskSelector.js		\
 	form/MultiDiskSelector.js	\
diff --git a/src/form/PruneKeepField.js b/src/form/PruneKeepField.js
new file mode 100644
index 0000000..a3a45fc
--- /dev/null
+++ b/src/form/PruneKeepField.js
@@ -0,0 +1,27 @@
+Ext.define('Proxmox.form.PruneKeepField', {
+    extend: 'Proxmox.form.field.Integer',
+    xtype: 'pmxPruneKeepField',
+
+    allowBlank: true,
+    minValue: 1,
+
+    listeners: {
+	change: function(field, newValue, oldValue) {
+	    if (newValue !== this.originalValue) {
+		this.triggers.clear.setVisible(true);
+	    }
+	},
+    },
+    triggers: {
+	clear: {
+	    cls: 'pmx-clear-trigger',
+	    weight: -1,
+	    hidden: true,
+	    handler: function() {
+		this.triggers.clear.setVisible(false);
+		this.setValue(this.originalValue);
+	    },
+	},
+    },
+
+});