diff --git a/Dockerfile b/Dockerfile
index 613fa4c1f2a6558d675cff7697b637821321e23c..5929913ff939bcc20e41da70011e452f8cb33ca2 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -27,7 +27,7 @@ RUN apt-get update \
     libnss-unknown \
     openssh-client \
     swig \
-    && apt-get clean
+    && apt-get clean \
     && rm -rf /var/lib/apt/lists/*
 
 # gluon build fails when running as root