diff --git a/Dockerfile b/Dockerfile
index 4ceaf9968..69db2ac1f 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -16,7 +16,7 @@
 
 FROM ubuntu:14.04
 
-ENV REBUILD_COUNTER=1
+ENV REBUILD_COUNTER=2
 
 ENV QT5_VERSION=59
 ENV QT5_PPA_VERSION=${QT5_VERSION}2
diff --git a/ci/trusty/Dockerfile b/ci/trusty/Dockerfile
index d8911f2af..cdaba3a07 100644
--- a/ci/trusty/Dockerfile
+++ b/ci/trusty/Dockerfile
@@ -18,7 +18,7 @@
 
 FROM ubuntu:14.04
 
-ENV REBUILD_COUNTER=1
+ENV REBUILD_COUNTER=2
 
 ENV QT5_VERSION=53
 ENV QT5_PPA_VERSION=${QT5_VERSION}2