diff --git a/Dockerfile b/Dockerfile
index 5f138b0..0c33d70 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -3,7 +3,7 @@ FROM debian:jessie
 MAINTAINER Chris Kuehl <ckuehl@yelp.com>
 RUN DEBIAN_FRONTEND=noninteractive apt-get update && \
     apt-get install -y --no-install-recommends \
-        build-essential devscripts equivs && \
+        build-essential devscripts equivs procps psmisc && \
     apt-get clean
 WORKDIR /mnt
 
diff --git a/Makefile b/Makefile
index 3f971a7..6c48ff3 100644
--- a/Makefile
+++ b/Makefile
@@ -3,7 +3,7 @@ CFLAGS=-std=gnu99 -static -Wall -Werror
 DOCKER_RUN_TEST := docker run -v $(PWD):/mnt:ro
 DOCKER_DEB_TEST := sh -euxc ' \
 	apt-get update \
-	&& apt-get install -y --no-install-recommends procps \
+	&& apt-get install -y --no-install-recommends procps psmisc \
 	&& (which timeout || apt-get install -y --no-install-recommends timeout) \
 	&& dpkg -i /mnt/dist/*.deb \
 	&& cd /mnt \
@@ -11,7 +11,7 @@ DOCKER_DEB_TEST := sh -euxc ' \
 '
 DOCKER_PYTHON_TEST := sh -uexc ' \
 	apt-get update \
-	&& apt-get install -y --no-install-recommends python-pip build-essential procps \
+	&& apt-get install -y --no-install-recommends python-pip build-essential procps psmisc \
 	&& (which timeout || apt-get install -y --no-install-recommends timeout) \
 	&& tmp=$$(mktemp -d) \
 	&& cp -r /mnt/* "$$tmp" \