diff --git a/libs/pbd/pbd/xml++.h b/libs/pbd/pbd/xml++.h
index dac8de67cd..0e1bd09cc2 100644
--- a/libs/pbd/pbd/xml++.h
+++ b/libs/pbd/pbd/xml++.h
@@ -29,7 +29,7 @@
 
 #include <string>
 #include <vector>
-#include <unordered_map>
+#include <map>
 #include <cstdio>
 #include <cstdarg>
 
@@ -50,7 +50,7 @@ typedef XMLNodeList::const_iterator              XMLNodeConstIterator;
 typedef std::vector<XMLProperty*>                XMLPropertyList;
 typedef XMLPropertyList::iterator                XMLPropertyIterator;
 typedef XMLPropertyList::const_iterator          XMLPropertyConstIterator;
-typedef std::unordered_map<std::string, XMLProperty*>    XMLPropertyMap;
+typedef std::map<std::string, XMLProperty*>      XMLPropertyMap;
 
 class LIBPBD_API XMLTree {
 public:
diff --git a/libs/pbd/xml++.cc b/libs/pbd/xml++.cc
index b8fff12ad0..6d260f2525 100644
--- a/libs/pbd/xml++.cc
+++ b/libs/pbd/xml++.cc
@@ -408,7 +408,7 @@ XMLProperty*
 XMLNode::property(const char* n)
 {
 	string ns(n);
-	unordered_map<string,XMLProperty*>::iterator iter;
+	map<string,XMLProperty*>::iterator iter;
 
 	if ((iter = _propmap.find(ns)) != _propmap.end()) {
 		return iter->second;
@@ -420,7 +420,7 @@ XMLNode::property(const char* n)
 XMLProperty*
 XMLNode::property(const string& ns)
 {
-	unordered_map<string,XMLProperty*>::iterator iter;
+	map<string,XMLProperty*>::iterator iter;
 
 	if ((iter = _propmap.find(ns)) != _propmap.end()) {
 		return iter->second;
@@ -433,7 +433,7 @@ XMLProperty*
 XMLNode::add_property(const char* n, const string& v)
 {
 	string ns(n);
-        unordered_map<string,XMLProperty*>::iterator iter;
+        map<string,XMLProperty*>::iterator iter;
 
         if ((iter = _propmap.find(ns)) != _propmap.end()) {
                 iter->second->set_value (v);