diff --git a/docker/Dockerfile-plus1 b/docker/Dockerfile-plus1
index d82c1056f..92f11cf27 100644
--- a/docker/Dockerfile-plus1
+++ b/docker/Dockerfile-plus1
@@ -1,5 +1,5 @@
 ARG version
-FROM sitespeedio/sitespeed.io:{version}
+FROM sitespeedio/sitespeed.io:${version}
 
 ENV SITESPEED_IO_BROWSERTIME__XVFB true
 ENV SITESPEED_IO_BROWSERTIME__DOCKER true