diff --git a/extension.json b/extension.json
index 74246d6cab..d3790c63a3 100644
--- a/extension.json
+++ b/extension.json
@@ -2085,7 +2085,8 @@
 				"modules/ve-mw/ui/ve.ui.MWWikitextDataTransferHandlerFactory.js",
 				"modules/ve-mw/ui/ve.ui.MWWikitextSurface.js",
 				"modules/ve-mw/ui/actions/ve.ui.MWWikitextAction.js",
-				"modules/ve-mw/ui/inspectors/ve.ui.MWWikitextLinkAnnotationInspector.js"
+				"modules/ve-mw/ui/inspectors/ve.ui.MWWikitextLinkAnnotationInspector.js",
+				"modules/ve-mw/ui/datatransferhandlers/ve.ui.MWWikitextPlainTextStringTransferHandler.js"
 			],
 			"styles": [
 				"modules/ve-mw/ui/styles/ve.ui.MWWikitextSurface.css"
diff --git a/modules/ve-mw/ui/datatransferhandlers/ve.ui.MWWikitextPlainTextStringTransferHandler.js b/modules/ve-mw/ui/datatransferhandlers/ve.ui.MWWikitextPlainTextStringTransferHandler.js
new file mode 100644
index 0000000000..97e3ea2cb3
--- /dev/null
+++ b/modules/ve-mw/ui/datatransferhandlers/ve.ui.MWWikitextPlainTextStringTransferHandler.js
@@ -0,0 +1,57 @@
+/*!
+ * VisualEditor UserInterface MWWikitextPlainTextStringTransferHandler.
+ *
+ * @copyright 2011-2018 VisualEditor Team and others; see http://ve.mit-license.org
+ */
+
+/**
+ * Detect an attempt to paste plain text or wikitext, and allow it to be directly pasted without escaping it.
+ *
+ * This handler is only registered in source mode, as that's the mode where users are interacting
+ * with the plain-text equivalent of the content already. Without this handler, a paste with `text/plain`
+ * and `text/html` content would take the html content, run it through the normal paste flow, then convert
+ * the resultant HTML into wikitext via parsoid. This would have the side-effect of escaping any wikitext
+ * content that's in the paste with nowiki, which probably isn't what the paster actually wants.
+ *
+ * We also catch anything which has `text/x-wiki`, since it has explicitly come from a source-mode part
+ * of VE, and contains something that's definitely wikitext.
+ *
+ * @class
+ * @extends ve.ui.PlainTextStringTransferHandler
+ *
+ * @constructor
+ * @param {ve.ui.Surface} surface
+ * @param {ve.ui.DataTransferItem} item
+ */
+ve.ui.MWWikitextPlainTextStringTransferHandler = function VeUiMWWikitextPlainTextStringTransferHandler() {
+	// Parent constructor
+	ve.ui.MWWikitextPlainTextStringTransferHandler.super.apply( this, arguments );
+};
+
+/* Inheritance */
+
+OO.inheritClass( ve.ui.MWWikitextPlainTextStringTransferHandler, ve.ui.PlainTextStringTransferHandler );
+
+/* Static properties */
+
+ve.ui.MWWikitextPlainTextStringTransferHandler.static.name = 'wikitextPlainTextString';
+
+ve.ui.MWWikitextPlainTextStringTransferHandler.static.types =
+	ve.ui.MWWikitextPlainTextStringTransferHandler.super.static.types.concat(
+		[ 'text/x-wiki' ]
+	);
+
+ve.ui.MWWikitextPlainTextStringTransferHandler.static.handlesPaste = true;
+
+/* Methods */
+
+/**
+ * @inheritdoc
+ */
+ve.ui.MWWikitextPlainTextStringTransferHandler.prototype.process = function () {
+	this.resolve( this.item.getAsString() );
+};
+
+/* Registration */
+
+ve.ui.wikitextDataTransferHandlerFactory.register( ve.ui.MWWikitextPlainTextStringTransferHandler );