diff --git a/Dockerfile b/Dockerfile
index 6b313277..91eb6f39 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -16,7 +16,7 @@
 
 FROM ubuntu:14.04
 
-ENV REBUILD_COUNTER=2
+ENV REBUILD_COUNTER=4
 
 ENV QT5_VERSION=59
 ENV QT5_PPA_VERSION=${QT5_VERSION}2