diff --git a/Dockerfile b/Dockerfile
index a7224f4..6959979 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -21,7 +21,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
     liblzma-dev \
     llvm \
     make \
-    python-openssl
+    python-openssl \
     tk-dev \
     xz-utils \
     wget \