diff --git a/src/ol/format/wfs.js b/src/ol/format/wfs.js
index 814d3ee5c92..c4bedb8967c 100644
--- a/src/ol/format/wfs.js
+++ b/src/ol/format/wfs.js
@@ -392,10 +392,9 @@ ol.format.WFS.writeDelete_ = function(node, feature, objectStack) {
   ol.asserts.assert(feature.getId() !== undefined, 26); // Features must have an id set
   var featureType = context['featureType'];
   var featurePrefix = context['featurePrefix'];
-  featurePrefix = featurePrefix ? featurePrefix :
-      ol.format.WFS.FEATURE_PREFIX;
   var featureNS = context['featureNS'];
-  node.setAttribute('typeName', featurePrefix + ':' + featureType);
+  var typeName = ol.format.WFS.getTypeName_(featurePrefix, featureType);
+  node.setAttribute('typeName', typeName);
   ol.xml.setAttributeNS(node, ol.format.WFS.XMLNS, 'xmlns:' + featurePrefix,
       featureNS);
   var fid = feature.getId();
@@ -405,6 +404,25 @@ ol.format.WFS.writeDelete_ = function(node, feature, objectStack) {
 };
 
 
+/**
+ * @param {string|undefined} featurePrefix The prefix of the feature.
+ * @param {string} featureType The type of the feature.
+ * @returns {string} The value of the typeName property.
+ * @private
+ */
+ol.format.WFS.getTypeName_ = function(featurePrefix, featureType) {
+  featurePrefix = featurePrefix ? featurePrefix :
+      ol.format.WFS.FEATURE_PREFIX;
+  var prefix = featurePrefix + ':';
+  // The featureType already contains the prefix.
+  if (featureType.indexOf(prefix) === 0) {
+    return featureType;
+  } else {
+    return prefix + featureType;
+  }
+};
+
+
 /**
  * @param {Node} node Node.
  * @param {ol.Feature} feature Feature.
@@ -416,10 +434,9 @@ ol.format.WFS.writeUpdate_ = function(node, feature, objectStack) {
   ol.asserts.assert(feature.getId() !== undefined, 27); // Features must have an id set
   var featureType = context['featureType'];
   var featurePrefix = context['featurePrefix'];
-  featurePrefix = featurePrefix ? featurePrefix :
-      ol.format.WFS.FEATURE_PREFIX;
   var featureNS = context['featureNS'];
-  node.setAttribute('typeName', featurePrefix + ':' + featureType);
+  var typeName = ol.format.WFS.getTypeName_(featurePrefix, featureType);
+  node.setAttribute('typeName', typeName);
   ol.xml.setAttributeNS(node, ol.format.WFS.XMLNS, 'xmlns:' + featurePrefix,
       featureNS);
   var fid = feature.getId();
@@ -512,8 +529,14 @@ ol.format.WFS.writeQuery_ = function(node, featureType, objectStack) {
   var featureNS = context['featureNS'];
   var propertyNames = context['propertyNames'];
   var srsName = context['srsName'];
-  var prefix = featurePrefix ? featurePrefix + ':' : '';
-  node.setAttribute('typeName', prefix + featureType);
+  var typeName;
+  // If feature prefix is not defined, we must not use the default prefix.
+  if (featurePrefix) {
+    typeName = ol.format.WFS.getTypeName_(featurePrefix, featureType);
+  } else {
+    typeName = featureType;
+  }
+  node.setAttribute('typeName', typeName);
   if (srsName) {
     node.setAttribute('srsName', srsName);
   }