diff --git a/centos/resources/fusionpbx.sh b/centos/resources/fusionpbx.sh
index a48eb73..faa2550 100755
--- a/centos/resources/fusionpbx.sh
+++ b/centos/resources/fusionpbx.sh
@@ -12,7 +12,7 @@ verbose "Installing FusionPBX"
 
 #install dependencies
 yum -y install git
-yum -y install ghostscript libtiff-devel libtiff-tools
+yum -y install ghostscript libtiff-devel libtiff-tools at
 
 #forensics tools
 wget https://forensics.cert.org/cert-forensics-tools-release-el7.rpm
diff --git a/debian/resources/fusionpbx.sh b/debian/resources/fusionpbx.sh
index b0458ff..8b4aaeb 100755
--- a/debian/resources/fusionpbx.sh
+++ b/debian/resources/fusionpbx.sh
@@ -13,7 +13,7 @@ verbose "Installing FusionPBX"
 
 #install dependencies
 apt-get install -y --force-yes vim git dbus haveged ssl-cert
-apt-get install -y --force-yes ghostscript libtiff5-dev libtiff-tools
+apt-get install -y --force-yes ghostscript libtiff5-dev libtiff-tools at
 
 #get the branch
 if [ .$system_branch = .'master' ]; then
diff --git a/devuan/resources/fusionpbx.sh b/devuan/resources/fusionpbx.sh
index 47b99f2..9ebb1a4 100755
--- a/devuan/resources/fusionpbx.sh
+++ b/devuan/resources/fusionpbx.sh
@@ -13,7 +13,7 @@ verbose "Installing FusionPBX"
 
 #install dependencies
 apt-get install -qq -y git dbus haveged ssl-cert
-apt-get install -qq -y ghostscript libtiff5-dev libtiff-tools
+apt-get install -qq -y ghostscript libtiff5-dev libtiff-tools at
 
 #set the version
 if [ .$system_branch = .'master' ]; then
diff --git a/freebsd/resources/fusionpbx.sh b/freebsd/resources/fusionpbx.sh
index 4945cf1..6e0e6a6 100755
--- a/freebsd/resources/fusionpbx.sh
+++ b/freebsd/resources/fusionpbx.sh
@@ -11,7 +11,7 @@ cd "$(dirname "$0")"
 verbose "Installing FusionPBX"
 
 #install dependencies
-pkg install --yes git ghostscript9-base tiff
+pkg install --yes git ghostscript9-base tiff at
 
 #set the version
 if [ .$system_branch = .'master' ]; then