diff --git a/src/singularity_modules/r/3.5.3/r.def b/src/singularity_modules/r/3.5.3/r.def
index b154729b2a836ae771aad74f08174a42a75fa3ef..7575d9692cec418097a5f260cae1d76d3c803595 100644
--- a/src/singularity_modules/r/3.5.3/r.def
+++ b/src/singularity_modules/r/3.5.3/r.def
@@ -10,6 +10,7 @@ PACKAGES="libssl-dev \
 libcurl4-openssl-dev \
 libxml2-dev \
 zlib1g-dev \
+procps \
 git"
 
 apt-get update && \