diff --git a/services/document-updater/test/unit/coffee/HttpController/HttpControllerTests.coffee b/services/document-updater/test/unit/coffee/HttpController/HttpControllerTests.coffee
index 15b9142647..d7a27db854 100644
--- a/services/document-updater/test/unit/coffee/HttpController/HttpControllerTests.coffee
+++ b/services/document-updater/test/unit/coffee/HttpController/HttpControllerTests.coffee
@@ -13,6 +13,7 @@ describe "HttpController", ->
 				flushProjectChangesAsync: sinon.stub()
 			"./ProjectManager": @ProjectManager = {}
 			"logger-sharelatex" : @logger = { log: sinon.stub() }
+			"./ProjectFlusher": {flushAllProjects:->}
 			"./Metrics": @Metrics = {}
 			"./Errors" : Errors
 		@Metrics.Timer = class Timer