diff --git a/Dockerfile b/Dockerfile
index cf99265..5428137 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -20,3 +20,6 @@ COPY default-userscripts default-userscripts
 
 EXPOSE 8080
 ENTRYPOINT [ "python", "-u", "src/launcher.py" ]
+
+# Persist mitmproxy CA between container runs:
+VOLUME /root/.mitmproxy
diff --git a/Makefile b/Makefile
index 7f55c74..2fdc1c1 100644
--- a/Makefile
+++ b/Makefile
@@ -8,10 +8,6 @@ TAG ?= $(DEFAULT_TAG)
 FILE_WITH_VERSION = src/modules/constants.py
 DOCKER_USER = alling
 DOCKER_REPO = userscript-proxy
-# Can be anything:
-CA_VOLUME = mitmproxy-ca
-# Needs to match where mitmproxy stores its CA:
-CA_DIR = /root/.mitmproxy
 
 .PHONY : all
 all: image
@@ -50,4 +46,4 @@ endif
 
 start: image
 # The -t flag enables colored output:
-	docker run -t --rm -p 8080:8080 --name $(DOCKER_REPO) -v "$(CA_VOLUME):$(CA_DIR)" $(DOCKER_USER)/$(DOCKER_REPO):$(TAG)
+	docker run -t --rm -p 8080:8080 --name $(DOCKER_REPO) $(DOCKER_USER)/$(DOCKER_REPO):$(TAG)