diff --git a/core/server/errors.js b/core/server/errors.js
index 5b4828f7ed..bb5964aa7f 100644
--- a/core/server/errors.js
+++ b/core/server/errors.js
@@ -60,6 +60,12 @@ var ghostErrors = {
             statusCode: 409,
             errorType: 'DisabledFeatureError',
         }, options));
+    },
+    UpdateCollisionError: function UpdateCollisionError(options) {
+        GhostError.call(this, _.merge({
+            statusCode: 409,
+            errorType: 'UpdateCollisionError',
+        }, options));
     }
 };
 
diff --git a/core/server/models/plugins/collision.js b/core/server/models/plugins/collision.js
index 00a52bc635..fa43f8f487 100644
--- a/core/server/models/plugins/collision.js
+++ b/core/server/models/plugins/collision.js
@@ -55,7 +55,7 @@ module.exports = function (Bookshelf) {
 
                 if (Object.keys(changed).length) {
                     if (clientUpdatedAt.diff(serverUpdatedAt) !== 0) {
-                        return Promise.reject(new errors.InternalServerError({
+                        return Promise.reject(new errors.UpdateCollisionError({
                             message: 'Saving failed! Someone else is editing this post.',
                             code: 'UPDATE_COLLISION'
                         }));