diff --git a/circle.yml b/circle.yml
new file mode 100644
index 0000000..97109ef
--- /dev/null
+++ b/circle.yml
@@ -0,0 +1,8 @@
+machine:
+  services:
+    - docker
+
+test:
+  override:
+    - go test -v
+    - make CIRCLECI=true SUDO=sudo RM= -C zombietest
diff --git a/zombietest/Makefile b/zombietest/Makefile
index 757398d..c1d9b19 100644
--- a/zombietest/Makefile
+++ b/zombietest/Makefile
@@ -1,23 +1,27 @@
+GO?=go
+SUDO?=
+RM?=--rm
+
 .PHONY: test clean
 
 test: .test.uptodate
 	./test.bash
 
 .test.uptodate: runsvinit zombie run-zombie Dockerfile
-	docker build -t zombietest .
+	$(SUDO) docker build -t zombietest .
 	touch $@
 
 runsvinit: ../*.go
-	env GOOS=linux GOARCH=amd64 go build -o $@ github.com/peterbourgon/runsvinit
+	env GOOS=linux GOARCH=amd64 $(GO) build -o $@ github.com/peterbourgon/runsvinit
 
 zombie: .build.uptodate
-	docker run --rm -v $(shell pwd):/mount zombietest-build cc -Wall -Werror -o /mount/zombie /zombie.c
+	$(SUDO) docker run $(RM) -v $(shell pwd):/mount zombietest-build cc -Wall -Werror -o /mount/zombie /zombie.c
 
 .build.uptodate: build/zombie.c build/Dockerfile
-	docker build -t zombietest-build build/
+	$(SUDO) docker build -t zombietest-build build/
 	touch $@
 
 clean:
 	rm -rf .test.uptodate .build.uptodate runsvinit zombie
-	docker stop zombietest zombietest-build >/dev/null 2>&1 || true
-	docker rm zombietest zombietest-build >/dev/null 2>&1 || true
+	$(SUDO) docker stop zombietest zombietest-build >/dev/null 2>&1 || true
+	$(SUDO) docker rm zombietest zombietest-build >/dev/null 2>&1 || true
diff --git a/zombietest/test.bash b/zombietest/test.bash
index ca04214..f6339d8 100755
--- a/zombietest/test.bash
+++ b/zombietest/test.bash
@@ -1,11 +1,26 @@
 #!/bin/bash
 
-RC=0
+function zombies() {
+	if [ -z "$CIRCLECI" ]
+	then
+		docker exec $C ps -o pid,stat | grep Z | wc -l
+	else
+		# https://circleci.com/docs/docker#docker-exec
+		sudo lxc-attach -n "$(docker inspect --format '{{.Id}}' $C)" -- sh -c "ps -o pid,stat | grep Z | wc -l"
+	fi
+}
+
+function stop_rm() {
+	docker stop $1
+	docker rm $1
+}
+
 SLEEP=1
+RC=0
 
 C=$(docker run -d zombietest /runsvinit -reap=false)
 sleep $SLEEP
-NOREAP=$(docker exec $C ps -o pid,stat | grep Z | wc -l)
+NOREAP=$(zombies)
 echo -n without reaping, we have $NOREAP zombies...
 if [ "$NOREAP" -le "0" ]
 then
@@ -14,12 +29,11 @@ then
 else
 	echo " good"
 fi
-docker stop $C >/dev/null
-docker rm $C >/dev/null
+stop_rm $C
 
 C=$(docker run -d zombietest /runsvinit)
 sleep $SLEEP
-YESREAP=$(docker exec $C ps -o pid,stat | grep Z | wc -l)
+YESREAP=$(zombies)
 echo -n with reaping, we have $YESREAP zombies...
 if [ "$YESREAP" -gt "0" ]
 then
@@ -28,7 +42,6 @@ then
 else
 	echo " good"
 fi
-docker stop $C >/dev/null
-docker rm $C >/dev/null
+stop_rm $C
 
 exit $RC