diff --git a/puppet/zulip/manifests/common.pp b/puppet/zulip/manifests/common.pp
index 936398a557..c86188ca51 100644
--- a/puppet/zulip/manifests/common.pp
+++ b/puppet/zulip/manifests/common.pp
@@ -33,6 +33,11 @@ class zulip::common {
 
   $total_memory_mb = Integer($::memorysize_mb)
 
+  $goarch = $::architecture ? {
+    'amd64'   => 'amd64',
+    'aarch64' => 'arm64',
+  }
+
   $versions = {
     # https://github.com/cactus/go-camo/releases
     'go-camo' => {
diff --git a/puppet/zulip_ops/manifests/profile/grafana.pp b/puppet/zulip_ops/manifests/profile/grafana.pp
index b612c0ba1d..5621db1455 100644
--- a/puppet/zulip_ops/manifests/profile/grafana.pp
+++ b/puppet/zulip_ops/manifests/profile/grafana.pp
@@ -4,10 +4,6 @@ class zulip_ops::profile::grafana {
   include zulip_ops::profile::base
   include zulip::supervisor
 
-  $arch = $::architecture ? {
-    'amd64'   => 'amd64',
-    'aarch64' => 'arm64',
-  }
   $version = $zulip::common::versions['grafana']['version']
   $dir = "/srv/zulip-grafana-${version}"
   $bin = "${dir}/bin/grafana-server"
@@ -15,7 +11,7 @@ class zulip_ops::profile::grafana {
 
   zulip::external_dep { 'grafana':
     version        => $version,
-    url            => "https://dl.grafana.com/oss/release/grafana-${version}.linux-${arch}.tar.gz",
+    url            => "https://dl.grafana.com/oss/release/grafana-${version}.linux-${zulip::common::goarch}.tar.gz",
     tarball_prefix => "grafana-${version}",
   }
 
diff --git a/puppet/zulip_ops/manifests/profile/prometheus_server.pp b/puppet/zulip_ops/manifests/profile/prometheus_server.pp
index a0e3174347..104fdaa18b 100644
--- a/puppet/zulip_ops/manifests/profile/prometheus_server.pp
+++ b/puppet/zulip_ops/manifests/profile/prometheus_server.pp
@@ -6,10 +6,6 @@ class zulip_ops::profile::prometheus_server {
   include zulip_ops::profile::base
   include zulip_ops::prometheus::base
 
-  $arch = $::architecture ? {
-    'amd64'   => 'amd64',
-    'aarch64' => 'arm64',
-  }
   $version = $zulip::common::versions['prometheus']['version']
   $dir = "/srv/zulip-prometheus-${version}"
   $bin = "${dir}/prometheus"
@@ -17,8 +13,8 @@ class zulip_ops::profile::prometheus_server {
 
   zulip::external_dep { 'prometheus':
     version        => $version,
-    url            => "https://github.com/prometheus/prometheus/releases/download/v${version}/prometheus-${version}.linux-${arch}.tar.gz",
-    tarball_prefix => "prometheus-${version}.linux-${arch}",
+    url            => "https://github.com/prometheus/prometheus/releases/download/v${version}/prometheus-${version}.linux-${zulip::common::goarch}.tar.gz",
+    tarball_prefix => "prometheus-${version}.linux-${zulip::common::goarch}",
   }
   file { '/usr/local/bin/promtool':
     ensure  => 'link',
diff --git a/puppet/zulip_ops/manifests/prometheus/node.pp b/puppet/zulip_ops/manifests/prometheus/node.pp
index ffa9425173..5140306736 100644
--- a/puppet/zulip_ops/manifests/prometheus/node.pp
+++ b/puppet/zulip_ops/manifests/prometheus/node.pp
@@ -4,18 +4,14 @@ class zulip_ops::prometheus::node {
   include zulip_ops::prometheus::base
   include zulip::supervisor
 
-  $arch = $::architecture ? {
-    'amd64'   => 'amd64',
-    'aarch64' => 'arm64',
-  }
   $version = $zulip::common::versions['node_exporter']['version']
   $dir = "/srv/zulip-node_exporter-${version}"
   $bin = "${dir}/node_exporter"
 
   zulip::external_dep { 'node_exporter':
     version        => $version,
-    url            => "https://github.com/prometheus/node_exporter/releases/download/v${version}/node_exporter-${version}.linux-${arch}.tar.gz",
-    tarball_prefix => "node_exporter-${version}.linux-${arch}",
+    url            => "https://github.com/prometheus/node_exporter/releases/download/v${version}/node_exporter-${version}.linux-${zulip::common::goarch}.tar.gz",
+    tarball_prefix => "node_exporter-${version}.linux-${zulip::common::goarch}",
   }
 
   # This was moved to an external_dep in 2021/12, and these lines can
diff --git a/puppet/zulip_ops/manifests/prometheus/uwsgi.pp b/puppet/zulip_ops/manifests/prometheus/uwsgi.pp
index f7645a10a8..5280d88e83 100644
--- a/puppet/zulip_ops/manifests/prometheus/uwsgi.pp
+++ b/puppet/zulip_ops/manifests/prometheus/uwsgi.pp
@@ -4,14 +4,11 @@ class zulip_ops::prometheus::uwsgi {
   $version = $zulip::common::versions['uwsgi_exporter']['version']
   $dir = "/srv/zulip-uwsgi_exporter-${version}"
   $bin = "${dir}/uwsgi_exporter"
-  $arch = $::architecture ? {
-    'amd64'   => 'amd64',
-    'aarch64' => 'arm64',
-  }
+
   zulip::external_dep { 'uwsgi_exporter':
     version        => $version,
-    url            => "https://github.com/timonwong/uwsgi_exporter/releases/download/v${version}/uwsgi_exporter-${version}.linux-${arch}.tar.gz",
-    tarball_prefix => "uwsgi_exporter-${version}.linux-${arch}",
+    url            => "https://github.com/timonwong/uwsgi_exporter/releases/download/v${version}/uwsgi_exporter-${version}.linux-${zulip::common::goarch}.tar.gz",
+    tarball_prefix => "uwsgi_exporter-${version}.linux-${zulip::common::goarch}",
   }
 
   zulip_ops::firewall_allow { 'uwsgi_exporter': port => '9238' }