diff --git a/src/insets/InsetBibitem.cpp b/src/insets/InsetBibitem.cpp
index 3b77c8e0a5..6decdce7f4 100644
--- a/src/insets/InsetBibitem.cpp
+++ b/src/insets/InsetBibitem.cpp
@@ -351,7 +351,8 @@ docstring InsetBibitem::xhtml(XHTMLStream & xs, OutputParams const &) const
 	// need to use "name" anyway, eventually, because some browsers do not
 	// handle jumping to ids. If we don't do that, though, we can just put the
 	// id into the span tag.
-	string const attrs = "id='LyXCite-" + to_utf8(getParam("key")) + "'";
+	string const attrs = 
+		"id='LyXCite-" + to_utf8(html::cleanAttr(getParam("key"))) + "'";
 	xs << html::CompTag("a", attrs);
 	xs << html::StartTag("span", "class='bibitemlabel'");
 	xs << bibLabel();
diff --git a/src/insets/InsetBibtex.cpp b/src/insets/InsetBibtex.cpp
index 21e5f774ad..8f33a2de3c 100644
--- a/src/insets/InsetBibtex.cpp
+++ b/src/insets/InsetBibtex.cpp
@@ -960,7 +960,8 @@ docstring InsetBibtex::xhtml(XHTMLStream & xs, OutputParams const &) const
 		xs << html::StartTag("div", "class='bibtexentry'");
 		// FIXME XHTML
 		// The same name/id problem we have elsewhere.
-		string const attr = "id='LyXCite-" + to_utf8(entry.key()) + "'";
+		string const attr = 
+			"id='LyXCite-" + to_utf8(html::cleanAttr(entry.key())) + "'";
 		xs << html::CompTag("a", attr);
 		docstring citekey;
 		if (numbers)