diff --git a/runner/Dockerfile b/runner/Dockerfile
index ec4da526..8b9aa1a0 100644
--- a/runner/Dockerfile
+++ b/runner/Dockerfile
@@ -84,7 +84,7 @@ RUN export ARCH=$(echo ${TARGETPLATFORM} | cut -d / -f2) \
     && apt-get install -y libyaml-dev \
     && rm -rf /var/lib/apt/lists/*
 
-ENV AGENT_TOOLSDIRECTORY=/opt/hostedtoolcache
+ENV RUNNER_TOOL_CACHE=/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 25cac49c..abdf19a6 100644
--- a/runner/Dockerfile.dindrunner
+++ b/runner/Dockerfile.dindrunner
@@ -92,7 +92,7 @@ RUN export ARCH=$(echo ${TARGETPLATFORM} | cut -d / -f2) \
     && apt-get install -y libyaml-dev \
     && rm -rf /var/lib/apt/lists/*
 
-ENV AGENT_TOOLSDIRECTORY=/opt/hostedtoolcache
+ENV RUNNER_TOOL_CACHE=/opt/hostedtoolcache
 RUN mkdir /opt/hostedtoolcache \
     && chgrp docker /opt/hostedtoolcache \
     && chmod g+rwx /opt/hostedtoolcache
diff --git a/runner/Dockerfile.ubuntu.1804 b/runner/Dockerfile.ubuntu.1804
index 0e206806..ade028b1 100644
--- a/runner/Dockerfile.ubuntu.1804
+++ b/runner/Dockerfile.ubuntu.1804
@@ -84,7 +84,7 @@ RUN export ARCH=$(echo ${TARGETPLATFORM} | cut -d / -f2) \
     && apt-get install -y libyaml-dev \
     && rm -rf /var/lib/apt/lists/*
 
-ENV AGENT_TOOLSDIRECTORY=/opt/hostedtoolcache
+ENV RUNNER_TOOL_CACHE=/opt/hostedtoolcache
 RUN mkdir /opt/hostedtoolcache \
     && chgrp docker /opt/hostedtoolcache \
     && chmod g+rwx /opt/hostedtoolcache