diff --git a/src/projections/projectionsClient.js b/src/projections/projectionsClient.js
index 781694a..2808c74 100644
--- a/src/projections/projectionsClient.js
+++ b/src/projections/projectionsClient.js
@@ -102,8 +102,10 @@ ProjectionsClient.prototype.updateQuery = function(httpEndPoint, name, query, us
   return this.sendPut(httpEndPoint + '/projection/' + name + '/query?type=JS', query, userCredentials, HTTP_OK);
 };
 
-ProjectionsClient.prototype.delete = function(httpEndPoint, name, deleteEmittedStreams, userCredentials) {
-  return this.sendDelete(httpEndPoint + '/projection/' + name + '?deleteEmittedStreams=' + deleteEmittedStreams, userCredentials, HTTP_OK);
+ProjectionsClient.prototype.delete = function(httpEndPoint, name, deleteEmittedStreams, deleteStateStream, deleteCheckpointStream, userCredentials) {
+  const stateStream = (deleteStateStream === undefined) ? false : deleteStateStream;
+  const checkpointStream = (deleteCheckpointStream === undefined) ? false : deleteCheckpointStream;
+  return this.sendDelete(httpEndPoint + '/projection/' + name + '?deleteStateStream=' + stateStream + '&deleteCheckpointStream' + checkpointStream + '&deleteEmittedStreams=' + deleteEmittedStreams, userCredentials, HTTP_OK);
 };
 
 ProjectionsClient.prototype.request = function(method, _url, data, userCredentials, expectedCode) {
diff --git a/src/projections/projectionsManager.js b/src/projections/projectionsManager.js
index f453d4b..0c2fcf0 100644
--- a/src/projections/projectionsManager.js
+++ b/src/projections/projectionsManager.js
@@ -190,13 +190,15 @@ ProjectionsManager.prototype.updateQuery = function(name, query, userCredentials
 
 /**
  * Updates the definition of a query.
- * @param name                  The name of the projection.
- * @param deleteEmittedStreams  Whether to delete the streams that were emitted by this projection.
- * @param userCredentials       Credentials for a user with permission to delete a projection.
+ * @param name                    The name of the projection.
+ * @param deleteEmittedStreams    Whether to delete the streams that were emitted by this projection.
+ * @param deleteStateStream       Where to delete the state stream for this projection
+ * @param deleteCheckpointStream  Where to delete the checkpoint stream for this projection
+ * @param userCredentials         Credentials for a user with permission to delete a projection.
  * @returns {Promise<void>}
  */
-ProjectionsManager.prototype.delete = function(name, deleteEmittedStreams, userCredentials) {
-  return this._client.delete(this._httpEndPoint, name, deleteEmittedStreams, userCredentials);
+ProjectionsManager.prototype.delete = function(name, deleteEmittedStreams, deleteStateStream, deleteCheckpointStream, userCredentials) {
+  return this._client.delete(this._httpEndPoint, name, deleteEmittedStreams, deleteStateStream, deleteCheckpointStream, userCredentials);
 };
 
 module.exports = ProjectionsManager;
\ No newline at end of file