diff --git a/openfoam-2.4.0_openmpi-3.1.6.def b/openfoam-2.4.0_openmpi-3.1.6.def
index 4aaf8ba..143e223 100644
--- a/openfoam-2.4.0_openmpi-3.1.6.def
+++ b/openfoam-2.4.0_openmpi-3.1.6.def
@@ -23,6 +23,8 @@ From: ubuntu:16.04
     echo America/Buenos_Aires > /etc/localtime
     echo "Installing required packages..."
     apt-get update && apt-get install -y && apt-get install -y build-essential cmake flex bison zlib1g-dev qt4-dev-tools libqt4-dev libqtwebkit-dev gnuplot libreadline-dev libncurses-dev libxt-dev libboost-system-dev libboost-thread-dev libgmp-dev libmpfr-dev python python-dev libcgal-dev wget openssh-client
+    apt-get clean
+    rm -rf /var/lib/apt/lists/*
 
     export OMPI_DIR=/opt/ompi
     export OMPI_URL="https://download.open-mpi.org/release/open-mpi/v${OMPI_VERSION:0:-2}/openmpi-$OMPI_VERSION.tar.bz2"