diff --git a/kernel-python/container/Dockerfile b/kernel-python/container/Dockerfile
index a48cb64..6e3c36b 100644
--- a/kernel-python/container/Dockerfile
+++ b/kernel-python/container/Dockerfile
@@ -29,7 +29,7 @@ RUN chown jovyan:users /usr/local/bin/bootstrap-kernel.sh && \
 
 USER jovyan
 
-ENV KERNEL_LANGUAGE python
+ENV KERNEL_LANGUAGE=python
 
 # Disble healthcheck inherited from notebook image
 HEALTHCHECK NONE