diff --git a/ecs-schedule-runtasks.cfndsl.rb b/ecs-schedule-runtasks.cfndsl.rb
index 8ae32f5..cb13c6c 100644
--- a/ecs-schedule-runtasks.cfndsl.rb
+++ b/ecs-schedule-runtasks.cfndsl.rb
@@ -19,15 +19,14 @@
     run_tasks.each do |name, task|
       schedule = task['schedule']
       task_name = name.gsub("-","").gsub("_","")
-  
       container_overrides = {}
-      container_overrides.merge! name: task.has_key?('container') ? task['container'] : "#{task['task_definition']}"
-      container_overrides.merge! command: "#{task['command']}" if task.has_key?('command')
-      container_overrides.merge! environment: "#{task['env_vars']}" if task.has_key?('env_vars')
+      container_overrides[:name] = task.has_key?('container') ? task['container'] : "#{task['task_definition']}"
+      container_overrides[:command] = task['command'] if task.has_key?('command')
+      container_overrides[:environment] = task['env_vars'] if task.has_key?('env_vars')
       container_input = {
         containerOverrides: [container_overrides]
       }
-  
+
       unless schedule.nil?
         Events_Rule("#{task_name}Schedule") do
           Name FnSub("${EnvironmentName}-#{name}-schedule")
@@ -50,7 +49,7 @@
                 }
               }
             },
-            Input: container_input
+            Input: container_input.to_json()
           }]
         end
       end
diff --git a/spec/multipletasks_spec.rb b/spec/multipletasks_spec.rb
index 2965ade..afc7e94 100644
--- a/spec/multipletasks_spec.rb
+++ b/spec/multipletasks_spec.rb
@@ -39,8 +39,8 @@
              "TaskCount"=>1,
              "TaskDefinitionArn"=>{"Ref"=>"task1"}},
           "Id"=>"task1-dGFzazE",
-          "Input"=>{"containerOverrides"=>[{"name"=>"task1"}]},
-           "RoleArn"=>{"Fn::GetAtt"=>["EventBridgeInvokeRole", "Arn"]}}
+          "Input"=>"{\"containerOverrides\":[{\"name\":\"task1\"}]}",
+          "RoleArn"=>{"Fn::GetAtt"=>["EventBridgeInvokeRole", "Arn"]}}
       ])
     end
 
@@ -74,10 +74,8 @@
              "TaskCount"=>1,
              "TaskDefinitionArn"=>{"Ref"=>"task2"}},
           "Id"=>"task2-dGFzazI",
-          "Input"=>
-            {"containerOverrides"=>
-              [{"command"=>"[\"echo\", \"foo\", \"bar\"]", "name"=>"task2"}]},
-           "RoleArn"=>{"Fn::GetAtt"=>["EventBridgeInvokeRole", "Arn"]}}
+          "Input"=>"{\"containerOverrides\":[{\"name\":\"task2\",\"command\":[\"echo\",\"foo\",\"bar\"]}]}",
+          "RoleArn"=>{"Fn::GetAtt"=>["EventBridgeInvokeRole", "Arn"]}}
       ])
     end
 
diff --git a/spec/singletasks_spec.rb b/spec/singletasks_spec.rb
index e47dd27..cceb1c0 100644
--- a/spec/singletasks_spec.rb
+++ b/spec/singletasks_spec.rb
@@ -80,12 +80,8 @@
              "TaskCount"=>1,
              "TaskDefinitionArn"=>{"Ref"=>"mytask"}},
           "Id"=>"singletask-c2luZ2xldGFzaw",
-           "Input"=>
-              {"containerOverrides"=>
-                 [{"command"=>"[\"echo\", \"hello\", \"worrld\"]",
-                  "environment"=>"[{\"foo\"=>\"bar\"}]",
-                  "name"=>"singletask"}]},
-           "RoleArn"=>{"Fn::GetAtt"=>["EventBridgeInvokeRole", "Arn"]}}
+          "Input"=>"{\"containerOverrides\":[{\"name\":\"singletask\",\"command\":[\"echo\",\"hello world\"],\"environment\":[{\"foo\":\"bar\"}]}]}",
+          "RoleArn"=>{"Fn::GetAtt"=>["EventBridgeInvokeRole", "Arn"]}}
       ])
     end
 
diff --git a/tests/singletask.test.yaml b/tests/singletask.test.yaml
index 15cbcb0..a5f0956 100644
--- a/tests/singletask.test.yaml
+++ b/tests/singletask.test.yaml
@@ -16,8 +16,7 @@ run_tasks:
     task_definition: mytask
     command:
       - echo
-      - hello
-      - worrld
+      - hello world
     env_vars:
       - foo: bar
     schedule: rate(1 hour)