diff --git a/src/.docker_modules/macs3/3.0.0a6/Dockerfile b/src/.docker_modules/macs3/3.0.0a6/Dockerfile
index 80cf4d263d4fead7d0236d6cc1f7268eb79f8064..375b8f631fe40f9e05f94400d15057f303713438 100644
--- a/src/.docker_modules/macs3/3.0.0a6/Dockerfile
+++ b/src/.docker_modules/macs3/3.0.0a6/Dockerfile
@@ -10,5 +10,6 @@ RUN apt-get update -qq \
         liblzma-dev \
         libcurl4-gnutls-dev \
         libssl-dev \
-        libncurses5-dev
+        libncurses5-dev \
+        procps
 RUN pip install macs3==${MACS3_VERSION}