diff --git a/src/ol/format/kml.js b/src/ol/format/kml.js
index eff0966db2..20f0f3509e 100644
--- a/src/ol/format/kml.js
+++ b/src/ol/format/kml.js
@@ -2475,10 +2475,16 @@ ol.format.KML.writePrimitiveGeometry_ = function(node, geometry, objectStack) {
   var /** @type {ol.XmlNodeStackItem} */ context = {node: node};
   context['layout'] = geometry.getLayout();
   context['stride'] = geometry.getStride();
-  ol.xml.pushSerializeAndPop(context,
-      ol.format.KML.PRIMITIVE_GEOMETRY_SERIALIZERS_,
-      ol.format.KML.COORDINATES_NODE_FACTORY_,
-      [flatCoordinates], objectStack);
+
+  // serialize properties (properties unknown to KML are not serialized)
+  var properties = geometry.getProperties();
+  properties.coordinates = flatCoordinates;
+
+  var parentNode = objectStack[objectStack.length - 1].node;
+  var orderedKeys = ol.format.KML.PRIMITIVE_GEOMETRY_SEQUENCE_[parentNode.namespaceURI];
+  var values = ol.xml.makeSequence(properties, orderedKeys);
+  ol.xml.pushSerializeAndPop(context, ol.format.KML.PRIMITIVE_GEOMETRY_SERIALIZERS_,
+      ol.xml.OBJECT_PROPERTY_NODE_FACTORY, values, objectStack, orderedKeys);
 };
 
 
@@ -2639,7 +2645,6 @@ ol.format.KML.GEOMETRY_TYPE_TO_NODENAME_ = {
   'GeometryCollection': 'MultiGeometry'
 };
 
-
 /**
  * @const
  * @type {Object.<string, Array.<string>>}
@@ -2815,6 +2820,17 @@ ol.format.KML.PLACEMARK_SERIALIZERS_ = ol.xml.makeStructureNS(
     });
 
 
+/**
+ * @const
+ * @type {Object.<string, Array.<string>>}
+ * @private
+ */
+ol.format.KML.PRIMITIVE_GEOMETRY_SEQUENCE_ = ol.xml.makeStructureNS(
+    ol.format.KML.NAMESPACE_URIS_, [
+      'extrude', 'tessellate', 'altitudeMode', 'coordinates'
+    ]);
+
+
 /**
  * @const
  * @type {Object.<string, Object.<string, ol.XmlSerializer>>}
@@ -2822,6 +2838,9 @@ ol.format.KML.PLACEMARK_SERIALIZERS_ = ol.xml.makeStructureNS(
  */
 ol.format.KML.PRIMITIVE_GEOMETRY_SERIALIZERS_ = ol.xml.makeStructureNS(
     ol.format.KML.NAMESPACE_URIS_, {
+      'extrude': ol.xml.makeChildAppender(ol.format.XSD.writeBooleanTextNode),
+      'tessellate': ol.xml.makeChildAppender(ol.format.XSD.writeBooleanTextNode),
+      'altitudeMode': ol.xml.makeChildAppender(ol.format.XSD.writeStringTextNode),
       'coordinates': ol.xml.makeChildAppender(
           ol.format.KML.writeCoordinatesTextNode_)
     });
@@ -2933,16 +2952,6 @@ ol.format.KML.GEOMETRY_NODE_FACTORY_ = function(value, objectStack,
 ol.format.KML.COLOR_NODE_FACTORY_ = ol.xml.makeSimpleNodeFactory('color');
 
 
-/**
- * A factory for creating coordinates nodes.
- * @const
- * @type {function(*, Array.<*>, string=): (Node|undefined)}
- * @private
- */
-ol.format.KML.COORDINATES_NODE_FACTORY_ =
-    ol.xml.makeSimpleNodeFactory('coordinates');
-
-
 /**
  * A factory for creating Data nodes.
  * @const
diff --git a/test/spec/ol/format/kml.test.js b/test/spec/ol/format/kml.test.js
index 02d20dbdaa..e929c80d54 100644
--- a/test/spec/ol/format/kml.test.js
+++ b/test/spec/ol/format/kml.test.js
@@ -192,6 +192,33 @@ describe('ol.format.KML', function() {
           expect(node).to.xmleql(ol.xml.parse(text));
         });
 
+
+        it('can write properties', function() {
+          var lineString = new ol.geom.LineString([[1, 2], [3, 4]]);
+          lineString.set('extrude', false);
+          lineString.set('tessellate', true);
+          lineString.set('altitudeMode', 'clampToGround');
+          lineString.set('unsupportedProperty', 'foo');
+          var features = [new ol.Feature(lineString)];
+          var node = format.writeFeaturesNode(features);
+          var text =
+              '<kml xmlns="http://www.opengis.net/kml/2.2"' +
+              ' xmlns:gx="http://www.google.com/kml/ext/2.2"' +
+              ' xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"' +
+              ' xsi:schemaLocation="http://www.opengis.net/kml/2.2' +
+              ' https://developers.google.com/kml/schema/kml22gx.xsd">' +
+              '  <Placemark>' +
+              '    <LineString>' +
+              '      <extrude>0</extrude>' +
+              '      <tessellate>1</tessellate>' +
+              '      <altitudeMode>clampToGround</altitudeMode>' +
+              '      <coordinates>1,2 3,4</coordinates>' +
+              '    </LineString>' +
+              '  </Placemark>' +
+              '</kml>';
+          expect(node).to.xmleql(ol.xml.parse(text));
+        });
+
         it('can read Point geometries', function() {
           var text =
               '<kml xmlns="http://www.opengis.net/kml/2.2"' +