diff --git a/lib/terraforming/resource/cloud_watch_alarm.rb b/lib/terraforming/resource/cloud_watch_alarm.rb
index ec2d293a..b3a92af1 100644
--- a/lib/terraforming/resource/cloud_watch_alarm.rb
+++ b/lib/terraforming/resource/cloud_watch_alarm.rb
@@ -47,6 +47,7 @@ def alarm_attributes(alarm)
           "period" => alarm.period.to_s,
           "statistic" => alarm.statistic,
           "threshold" => alarm.threshold.to_s,
+          "treat_missing_data" => alarm.treat_missing_data,
           "unit" => sanitize(alarm.unit)
         }
         add_checksummed_attributes(attributes, alarm)
diff --git a/lib/terraforming/template/tf/cloud_watch_alarm.erb b/lib/terraforming/template/tf/cloud_watch_alarm.erb
index 4a859934..9ea08a66 100644
--- a/lib/terraforming/template/tf/cloud_watch_alarm.erb
+++ b/lib/terraforming/template/tf/cloud_watch_alarm.erb
@@ -8,6 +8,7 @@ resource "aws_cloudwatch_metric_alarm" "<%= normalize_module_name(alarm.alarm_na
     period              = "<%= alarm.period %>"
     statistic           = "<%= alarm.statistic %>"
     threshold           = "<%= alarm.threshold %>"
+    treat_missing_data  = "<%= alarm.treat_missing_data %>"
     alarm_description   = "<%= alarm.alarm_description %>"
 <%- unless alarm.ok_actions.empty? -%>
     ok_actions          = <%= alarm.ok_actions %>
@@ -19,7 +20,7 @@ resource "aws_cloudwatch_metric_alarm" "<%= normalize_module_name(alarm.alarm_na
     actions_enabled     = <%= alarm.actions_enabled %>
 <%- end -%>
 <%- unless alarm.dimensions.empty? -%>
-    dimensions {
+    dimensions          = {
 <% alarm.dimensions.each do |dimension| -%>
         <%= dimension.name %> = "<%= dimension.value %>"
 <% end -%>
diff --git a/spec/lib/terraforming/resource/cloud_watch_alarm_spec.rb b/spec/lib/terraforming/resource/cloud_watch_alarm_spec.rb
index b2eb6dd1..fb71ac0a 100644
--- a/spec/lib/terraforming/resource/cloud_watch_alarm_spec.rb
+++ b/spec/lib/terraforming/resource/cloud_watch_alarm_spec.rb
@@ -22,6 +22,7 @@ module Resource
             ok_actions: [],
             period: 300,
             statistic: "Average",
+            treat_missing_data: "missing",
             threshold: 10000.0
           },
           {
@@ -37,6 +38,7 @@ module Resource
             ok_actions: [],
             period: 120,
             statistic: "Average",
+            treat_missing_data: "notBreaching",
             threshold: 80.0
           }
         ]
@@ -58,9 +60,10 @@ module Resource
     period              = "300"
     statistic           = "Average"
     threshold           = "10000.0"
+    treat_missing_data  = "missing"
     alarm_description   = ""
     alarm_actions       = ["arn:aws:sns:region:account:lambda-alerts"]
-    dimensions {
+    dimensions          = {
         FunctionName = "beep-beep"
     }
 }
@@ -74,6 +77,7 @@ module Resource
     period              = "120"
     statistic           = "Average"
     threshold           = "80.0"
+    treat_missing_data  = "notBreaching"
     alarm_description   = "This metric monitors ec2 cpu utilization"
     actions_enabled     = false
 }
@@ -102,6 +106,7 @@ module Resource
                   "period" => "300",
                   "statistic" => "Average",
                   "threshold" => "10000.0",
+                  "treat_missing_data" => "missing",
                   "unit" => "",
                   "insufficient_data_actions.#" => "0",
                   "alarm_actions.#" => "1",
@@ -128,6 +133,7 @@ module Resource
                   "period" => "120",
                   "statistic" => "Average",
                   "threshold" => "80.0",
+                  "treat_missing_data" => "notBreaching",
                   "unit" => "",
                   "insufficient_data_actions.#" => "0",
                   "alarm_actions.#" => "0",