diff --git a/chrome/content/zotero/xpcom/style.js b/chrome/content/zotero/xpcom/style.js
index 1f04b69a8f..42e33154c0 100644
--- a/chrome/content/zotero/xpcom/style.js
+++ b/chrome/content/zotero/xpcom/style.js
@@ -845,8 +845,11 @@ Zotero.Style.prototype.getCiteProc = function (locale, format, options = {}) {
 		let styleDOMXML = new DOMParser()
 			.parseFromString(this.getXML(), "text/xml");
 		
-		// apply XSLT and serialize output
-		let newDOMXML = Zotero.Styles.xsltProcessor.transformToDocument(styleDOMXML);
+		// apply XSLT and serialize output. transformToFragment() is used because
+		// transformToDocument() needs a load group, which it takes from the source
+		// document or from the window that created the processor, and there's
+		// neither here.
+		let newDOMXML = Zotero.Styles.xsltProcessor.transformToFragment(styleDOMXML, styleDOMXML);
 		var xml = new XMLSerializer().serializeToString(newDOMXML);
 	} else {
 		var xml = this.getXML();
diff --git a/test/tests/styleTest.js b/test/tests/styleTest.js
index 1e86b930fa..1bbb0f4807 100644
--- a/test/tests/styleTest.js
+++ b/test/tests/styleTest.js
@@ -253,4 +253,30 @@ describe("Zotero.Styles", function () {
 			assert.equal(style.effectiveLocale, "en-US");
 		});
 	});
+
+	describe("CSL 0.8 styles", function () {
+		var csl08Style = `<?xml version="1.0" encoding="utf-8"?>
+		<style xmlns="http://purl.org/net/xbiblio/csl" class="in-text" xml:lang="en">
+		  <info>
+			<title>Test 0.8 Style</title>
+			<id>http://www.zotero.org/styles/test-08</id>
+			<updated>2010-01-01T00:00:00+00:00</updated>
+		  </info>
+		  <bibliography>
+			<layout>
+			  <text variable="title"/>
+			</layout>
+		  </bibliography>
+		</style>
+		`;
+		
+		it("should upgrade a style to CSL 1.0 and format a bibliography", async function () {
+			var item = await createDataObject('item', { title: 'Foo Bar' });
+			var style = new Zotero.Style(csl08Style);
+			assert.equal(style._version, "0.8");
+			var cslEngine = style.getCiteProc('en-US', 'text');
+			var text = Zotero.Cite.makeFormattedBibliographyOrCitationList(cslEngine, [item], "text");
+			assert.equal(text, 'Foo Bar\n');
+		});
+	});
 });