diff --git a/runner/Dockerfile b/runner/Dockerfile
index f3d7fe4..ec4da52 100644
--- a/runner/Dockerfile
+++ b/runner/Dockerfile
@@ -84,8 +84,8 @@ RUN export ARCH=$(echo ${TARGETPLATFORM} | cut -d / -f2) \
     && apt-get install -y libyaml-dev \
     && rm -rf /var/lib/apt/lists/*
 
-RUN echo AGENT_TOOLSDIRECTORY=/opt/hostedtoolcache > .env \
-    && mkdir /opt/hostedtoolcache \
+ENV AGENT_TOOLSDIRECTORY=/opt/hostedtoolcache
+RUN mkdir /opt/hostedtoolcache \
     && chgrp docker /opt/hostedtoolcache \
     && chmod g+rwx /opt/hostedtoolcache
 
diff --git a/runner/Dockerfile.dindrunner b/runner/Dockerfile.dindrunner
index 8d5cea5..25cac49 100644
--- a/runner/Dockerfile.dindrunner
+++ b/runner/Dockerfile.dindrunner
@@ -92,11 +92,11 @@ RUN export ARCH=$(echo ${TARGETPLATFORM} | cut -d / -f2) \
     && apt-get install -y libyaml-dev \
     && rm -rf /var/lib/apt/lists/*
 
-RUN echo AGENT_TOOLSDIRECTORY=/opt/hostedtoolcache > /runner.env \
-    && mkdir /opt/hostedtoolcache \
+ENV AGENT_TOOLSDIRECTORY=/opt/hostedtoolcache
+RUN mkdir /opt/hostedtoolcache \
     && chgrp docker /opt/hostedtoolcache \
     && chmod g+rwx /opt/hostedtoolcache
-
+    
 COPY modprobe startup.sh /usr/local/bin/
 COPY supervisor/ /etc/supervisor/conf.d/
 COPY logger.sh /opt/bash-utils/logger.sh
diff --git a/runner/Dockerfile.ubuntu.1804 b/runner/Dockerfile.ubuntu.1804
index 21f341e..0e20680 100644
--- a/runner/Dockerfile.ubuntu.1804
+++ b/runner/Dockerfile.ubuntu.1804
@@ -84,8 +84,8 @@ RUN export ARCH=$(echo ${TARGETPLATFORM} | cut -d / -f2) \
     && apt-get install -y libyaml-dev \
     && rm -rf /var/lib/apt/lists/*
 
-RUN echo AGENT_TOOLSDIRECTORY=/opt/hostedtoolcache > .env \
-    && mkdir /opt/hostedtoolcache \
+ENV AGENT_TOOLSDIRECTORY=/opt/hostedtoolcache
+RUN mkdir /opt/hostedtoolcache \
     && chgrp docker /opt/hostedtoolcache \
     && chmod g+rwx /opt/hostedtoolcache