diff --git a/renode_rcc/Dockerfile b/renode_rcc/Dockerfile
index 3e8e403..8c528f4 100644
--- a/renode_rcc/Dockerfile
+++ b/renode_rcc/Dockerfile
@@ -1,6 +1,6 @@
 FROM ubuntu:20.04
 WORKDIR /root
-ENV DEBIAN_FRONTEND noninteractive
+ENV DEBIAN_FRONTEND=noninteractive
 
 # Using Docker BuildKit cache mounts for /var/cache/apt and /var/lib/apt ensures that
 # the cache won't make it into the built image but will be maintained between steps.
@@ -38,7 +38,7 @@ RUN ./build-prom.sh
 RUN mv rcc-1.3.0-gcc/ /opt/renode/
 RUN mv grlib-gpl-2024.1-b4291 /opt/renode/
 
-ENV PATH $PATH:/opt/renode/rcc-1.3.0-gcc/bin
+ENV PATH=$PATH:/opt/renode/rcc-1.3.0-gcc/bin
 
 WORKDIR /root
 COPY config .config/renode/