diff --git a/tools/appliance/definitions/systemvm64template/postinstall.sh b/tools/appliance/definitions/systemvm64template/postinstall.sh
index a90b06c2e2c..fc6a3dc2429 100644
--- a/tools/appliance/definitions/systemvm64template/postinstall.sh
+++ b/tools/appliance/definitions/systemvm64template/postinstall.sh
@@ -110,6 +110,7 @@ install_packages() {
   apt-get --no-install-recommends -q -y --force-yes install radvd
 
   # do a final update and upgrade
+  apt-get clean
   apt-get update
   apt-get -y --force-yes upgrade
 }
diff --git a/tools/appliance/definitions/systemvmtemplate/postinstall.sh b/tools/appliance/definitions/systemvmtemplate/postinstall.sh
index 927bbeacc14..91ec107eb16 100644
--- a/tools/appliance/definitions/systemvmtemplate/postinstall.sh
+++ b/tools/appliance/definitions/systemvmtemplate/postinstall.sh
@@ -100,6 +100,7 @@ install_packages() {
   apt-get --no-install-recommends -q -y --force-yes install radvd
 
   # do a final update and upgrade
+  apt-get clean
   apt-get update
   apt-get -y --force-yes upgrade
 }