diff --git a/tools/appliance/definitions/systemvm64template/postinstall.sh b/tools/appliance/definitions/systemvm64template/postinstall.sh
index 648e93480a4..e523e25c3b1 100644
--- a/tools/appliance/definitions/systemvm64template/postinstall.sh
+++ b/tools/appliance/definitions/systemvm64template/postinstall.sh
@@ -69,6 +69,7 @@ install_packages() {
   apt-get --no-install-recommends -q -y --force-yes install keepalived conntrackd ipvsadm libnetfilter-conntrack3 libnl1
   # ipcalc
   apt-get --no-install-recommends -q -y --force-yes install ipcalc
+  apt-get update
   # java
   apt-get --no-install-recommends -q -y --force-yes install  openjdk-7-jre-headless
 
diff --git a/tools/appliance/definitions/systemvmtemplate/postinstall.sh b/tools/appliance/definitions/systemvmtemplate/postinstall.sh
index 0828dbff0b5..910dc015b75 100644
--- a/tools/appliance/definitions/systemvmtemplate/postinstall.sh
+++ b/tools/appliance/definitions/systemvmtemplate/postinstall.sh
@@ -65,6 +65,7 @@ install_packages() {
   apt-get --no-install-recommends -q -y --force-yes install keepalived conntrackd ipvsadm libnetfilter-conntrack3 libnl1
   # ipcalc
   apt-get --no-install-recommends -q -y --force-yes install ipcalc
+  apt-get update
   # java
   apt-get --no-install-recommends -q -y --force-yes install  openjdk-7-jre-headless