diff --git a/state_machine.json b/state_machine.json
index 718262a..7327324 100644
--- a/state_machine.json
+++ b/state_machine.json
@@ -33,9 +33,9 @@
             "DeviceName": "/dev/xvda",
             "Ebs": {
               "DeleteOnTermination": true,
-              "Iops.$": "States.StringToJson(${ebs_volume_settings.iops})",
-              "Throughput.$": "States.StringToJson(${ebs_volume_settings.throughput})",
-              "VolumeSize.$": "States.StringToJson(${ebs_volume_settings.volume_size})",
+              "Iops.$": ${ebs_volume_settings.iops},
+              "Throughput.$": ${ebs_volume_settings.throughput},
+              "VolumeSize.$": ${ebs_volume_settings.volume_size},
               "VolumeType": "gp3"
             }
           },
@@ -43,9 +43,9 @@
             "DeviceName": "/dev/xvdb",
             "Ebs": {
               "DeleteOnTermination": true,
-              "Iops.$": "States.StringToJson(${ebs_volume_settings.iops})",
-              "Throughput.$": "States.StringToJson(${ebs_volume_settings.throughput})",
-              "VolumeSize.$": "States.StringToJson(${ebs_volume_settings.volume_size})",
+              "Iops.$": ${ebs_volume_settings.iops},
+              "Throughput.$": ${ebs_volume_settings.throughput},
+              "VolumeSize.$": ${ebs_volume_settings.volume_size},
               "VolumeType": "gp3"
             }
           }