diff --git a/src/Buffer.cpp b/src/Buffer.cpp
index 2455b808fb..c6a8c2202b 100644
--- a/src/Buffer.cpp
+++ b/src/Buffer.cpp
@@ -3269,10 +3269,10 @@ void Buffer::listParentMacros(MacroSet & macros, LaTeXFeatures & features) const
 }
 
 
-Buffer::References & Buffer::references(docstring const & label)
+Buffer::References & Buffer::getReferenceCache(docstring const & label)
 {
 	if (d->parent())
-		return const_cast<Buffer *>(masterBuffer())->references(label);
+		return const_cast<Buffer *>(masterBuffer())->getReferenceCache(label);
 
 	RefCache::iterator it = d->ref_cache_.find(label);
 	if (it != d->ref_cache_.end())
@@ -3288,7 +3288,14 @@ Buffer::References & Buffer::references(docstring const & label)
 
 Buffer::References const & Buffer::references(docstring const & label) const
 {
-	return const_cast<Buffer *>(this)->references(label);
+	return const_cast<Buffer *>(this)->getReferenceCache(label);
+}
+
+
+void Buffer::addReference(docstring const & label, Inset * inset, ParIterator it)
+{
+	References & refs = getReferenceCache(label);
+	refs.push_back(make_pair(inset, it));
 }
 
 
diff --git a/src/Buffer.h b/src/Buffer.h
index cd0540cb7b..e30a09a9c5 100644
--- a/src/Buffer.h
+++ b/src/Buffer.h
@@ -660,10 +660,15 @@ public:
 
 	///
 	typedef std::vector<std::pair<Inset *, ParIterator> > References;
-	References & references(docstring const & label);
+	///
 	References const & references(docstring const & label) const;
+	///
+	void addReference(docstring const & label, Inset * inset, ParIterator it);
+	///
 	void clearReferenceCache() const;
+	///
 	void setInsetLabel(docstring const & label, InsetLabel const * il);
+	///
 	InsetLabel const * insetLabel(docstring const & label) const;
 
 	/// return a list of all used branches (also in children)
@@ -713,6 +718,8 @@ private:
 	/// mark the buffer as busy exporting something, or not
 	void setExportStatus(bool e) const;
 
+	///
+	References & getReferenceCache(docstring const & label);
 	/// Change name of buffer. Updates "read-only" flag.
 	void setFileName(support::FileName const & fname);
 	///
diff --git a/src/insets/InsetLabel.cpp b/src/insets/InsetLabel.cpp
index c2ef896b86..4dfbc96448 100644
--- a/src/insets/InsetLabel.cpp
+++ b/src/insets/InsetLabel.cpp
@@ -109,9 +109,9 @@ void InsetLabel::updateLabelAndRefs(docstring const & new_label,
 void InsetLabel::updateReferences(docstring const & old_label,
 		docstring const & new_label)
 {
-	Buffer::References & refs = buffer().references(old_label);
-	Buffer::References::iterator it = refs.begin();
-	Buffer::References::iterator end = refs.end();
+	Buffer::References const & refs = buffer().references(old_label);
+	Buffer::References::const_iterator it = refs.begin();
+	Buffer::References::const_iterator end = refs.end();
 	for (; it != end; ++it) {
 		buffer().undo().recordUndo(CursorData(it->second));
 		if (it->first->lyxCode() == MATH_REF_CODE) {
diff --git a/src/insets/InsetRef.cpp b/src/insets/InsetRef.cpp
index 0c8e471d5c..42e7fabe1a 100644
--- a/src/insets/InsetRef.cpp
+++ b/src/insets/InsetRef.cpp
@@ -270,7 +270,7 @@ void InsetRef::updateBuffer(ParIterator const & it, UpdateType)
 {
 	docstring const & ref = getParam("reference");
 	// register this inset into the buffer reference cache.
-	buffer().references(ref).push_back(make_pair(this, it));
+	buffer().addReference(ref, this, it);
 
 	docstring label;
 	for (int i = 0; !types[i].latex_name.empty(); ++i) {
diff --git a/src/mathed/InsetMathRef.cpp b/src/mathed/InsetMathRef.cpp
index ae1768351c..ef08cbcd3d 100644
--- a/src/mathed/InsetMathRef.cpp
+++ b/src/mathed/InsetMathRef.cpp
@@ -184,7 +184,7 @@ void InsetMathRef::updateBuffer(ParIterator const & it, UpdateType /*utype*/)
 		return;
 	}
 	// register this inset into the buffer reference cache.
-	buffer().references(getTarget()).push_back(make_pair(this, it));
+	buffer().addReference(getTarget(), this, it);
 }