diff --git a/states/statefile/testdata/roundtrip/v3-bigint.in.tfstate b/states/statefile/testdata/roundtrip/v3-bigint.in.tfstate
new file mode 100644
index 000000000000..eadc3e7c2bcf
--- /dev/null
+++ b/states/statefile/testdata/roundtrip/v3-bigint.in.tfstate
@@ -0,0 +1,136 @@
+{
+    "version": 3,
+    "terraform_version": "0.11.1",
+    "serial": 8,
+    "lineage": "0f5b2ff9-6ff5-8e9e-1f81-aa3ce9a483eb",
+    "backend": {
+        "hash": 10669755453527594976
+    },
+    "modules": [
+        {
+            "path": [
+                "root"
+            ],
+            "outputs": {
+                "results": {
+                    "sensitive": false,
+                    "type": "map",
+                    "value": {
+                        "aws_region": "us-west-2",
+                        "list": "[{\"triggers\":{\"index\":\"0\"}},{\"triggers\":{\"index\":\"1\"}}]",
+                        "list_item_0": "{\"triggers\":{\"index\":\"0\"}}",
+                        "list_item_1": "{\"triggers\":{\"index\":\"1\"}}",
+                        "list_triggers": "[{\"index\":\"0\"},{\"index\":\"1\"}]",
+                        "list_triggers_item": "{\"index\":\"0\"}",
+                        "module_object": "{\"test\":\"hello us-west-2\",\"test2\":\"hello world 2\"}",
+                        "module_output": "hello us-west-2",
+                        "single": "{\"triggers\":{\"baz\":\"BAR\",\"cwd_path\":\"/home/mart/Devel/terraform/tmp/hcl2-simple\",\"foo\":\"bar\",\"format\":\"Hello 12\",\"json\":\"{\\\"foo\\\":\\\"bar\\\",\\\"wonk\\\":[]}\",\"module_path\":\"/home/mart/Devel/terraform/tmp/hcl2-simple\",\"root_path\":\"/home/mart/Devel/terraform/tmp/hcl2-simple\",\"woot\":\"us-west-2\",\"workspace\":\"default\"}}"
+                    }
+                }
+            },
+            "resources": {
+                "null_resource.bar.0": {
+                    "type": "null_resource",
+                    "depends_on": [
+                        "null_resource.baz"
+                    ],
+                    "primary": {
+                        "id": "604776346677326098",
+                        "attributes": {
+                            "id": "604776346677326098",
+                            "triggers.%": "1",
+                            "triggers.index": "0"
+                        },
+                        "meta": {
+                            "schema_version": "1"
+                        },
+                        "tainted": false
+                    },
+                    "deposed": [],
+                    "provider": "provider.null"
+                },
+                "null_resource.bar.1": {
+                    "type": "null_resource",
+                    "depends_on": [
+                        "null_resource.baz"
+                    ],
+                    "primary": {
+                        "id": "4776432143683449212",
+                        "attributes": {
+                            "id": "4776432143683449212",
+                            "triggers.%": "1",
+                            "triggers.index": "1"
+                        },
+                        "meta": {},
+                        "tainted": false
+                    },
+                    "deposed": [],
+                    "provider": "provider.null"
+                },
+                "null_resource.baz": {
+                    "type": "null_resource",
+                    "depends_on": [],
+                    "primary": {
+                        "id": "1361331090091665738",
+                        "attributes": {
+                            "id": "1361331090091665738",
+                            "triggers.%": "9",
+                            "triggers.baz": "BAR",
+                            "triggers.cwd_path": "/home/mart/Devel/terraform/tmp/hcl2-simple",
+                            "triggers.foo": "bar",
+                            "triggers.format": "Hello 12",
+                            "triggers.json": "{\"foo\":\"bar\",\"wonk\":[]}",
+                            "triggers.module_path": "/home/mart/Devel/terraform/tmp/hcl2-simple",
+                            "triggers.root_path": "/home/mart/Devel/terraform/tmp/hcl2-simple",
+                            "triggers.woot": "us-west-2",
+                            "triggers.workspace": "default"
+                        },
+                        "meta": {
+                            "foo": "bar"
+                        },
+                        "tainted": false
+                    },
+                    "deposed": [],
+                    "provider": "provider.null"
+                }
+            },
+            "depends_on": []
+        },
+        {
+            "path": [
+                "root",
+                "child"
+            ],
+            "outputs": {
+                "test": {
+                    "sensitive": false,
+                    "type": "string",
+                    "value": "hello us-west-2"
+                },
+                "test2": {
+                    "sensitive": false,
+                    "type": "string",
+                    "value": "hello world 2"
+                }
+            },
+            "resources": {
+                "null_resource.foo": {
+                    "type": "null_resource",
+                    "depends_on": [],
+                    "primary": {
+                        "id": "1361",
+                        "attributes": {
+                            "id": "1361",
+                            "triggers.%": "0"
+                        },
+                        "meta": {},
+                        "tainted": false
+                    },
+                    "deposed": [],
+                    "provider": "provider.null"
+                }
+            },
+            "depends_on": []
+        }
+    ]
+}
diff --git a/states/statefile/testdata/roundtrip/v3-bigint.out.tfstate b/states/statefile/testdata/roundtrip/v3-bigint.out.tfstate
new file mode 100644
index 000000000000..c5531f24cdb7
--- /dev/null
+++ b/states/statefile/testdata/roundtrip/v3-bigint.out.tfstate
@@ -0,0 +1,97 @@
+{
+    "version": 4,
+    "terraform_version": "0.11.1",
+    "serial": 8,
+    "lineage": "0f5b2ff9-6ff5-8e9e-1f81-aa3ce9a483eb",
+    "outputs": {
+        "results": {
+            "type": [
+                "map",
+                "string"
+            ],
+            "value": {
+                "aws_region": "us-west-2",
+                "list": "[{\"triggers\":{\"index\":\"0\"}},{\"triggers\":{\"index\":\"1\"}}]",
+                "list_item_0": "{\"triggers\":{\"index\":\"0\"}}",
+                "list_item_1": "{\"triggers\":{\"index\":\"1\"}}",
+                "list_triggers": "[{\"index\":\"0\"},{\"index\":\"1\"}]",
+                "list_triggers_item": "{\"index\":\"0\"}",
+                "module_object": "{\"test\":\"hello us-west-2\",\"test2\":\"hello world 2\"}",
+                "module_output": "hello us-west-2",
+                "single": "{\"triggers\":{\"baz\":\"BAR\",\"cwd_path\":\"/home/mart/Devel/terraform/tmp/hcl2-simple\",\"foo\":\"bar\",\"format\":\"Hello 12\",\"json\":\"{\\\"foo\\\":\\\"bar\\\",\\\"wonk\\\":[]}\",\"module_path\":\"/home/mart/Devel/terraform/tmp/hcl2-simple\",\"root_path\":\"/home/mart/Devel/terraform/tmp/hcl2-simple\",\"woot\":\"us-west-2\",\"workspace\":\"default\"}}"
+            }
+        }
+    },
+    "resources": [
+        {
+            "mode": "managed",
+            "type": "null_resource",
+            "name": "bar",
+            "each": "list",
+            "provider": "provider.null",
+            "instances": [
+                {
+                    "attributes_flat": {
+                        "id": "604776346677326098",
+                        "triggers.%": "1",
+                        "triggers.index": "0"
+                    },
+                    "depends_on": ["null_resource.baz"],
+                    "index_key": 0,
+                    "schema_version": 1
+                },
+                {
+                    "attributes_flat": {
+                        "id": "604776346677326098",
+                        "triggers.%": "1",
+                        "triggers.index": "0"
+                    },
+                    "depends_on": ["null_resource.baz"],
+                    "index_key": 1,
+                    "schema_version": 0
+                }
+            ]
+        },
+        {
+            "mode": "managed",
+            "type": "null_resource",
+            "name": "baz",
+            "provider": "provider.null",
+            "instances": [
+                {
+                    "attributes_flat": {
+                        "id": "1361331090091665738",
+                        "triggers.%": "9",
+                        "triggers.baz": "BAR",
+                        "triggers.cwd_path": "/home/mart/Devel/terraform/tmp/hcl2-simple",
+                        "triggers.foo": "bar",
+                        "triggers.format": "Hello 12",
+                        "triggers.json": "{\"foo\":\"bar\",\"wonk\":[]}",
+                        "triggers.module_path": "/home/mart/Devel/terraform/tmp/hcl2-simple",
+                        "triggers.root_path": "/home/mart/Devel/terraform/tmp/hcl2-simple",
+                        "triggers.woot": "us-west-2",
+                        "triggers.workspace": "default"
+                    },
+                    "schema_version": 0,
+                    "private": "eyJmb28iOiJiYXIifQ=="
+                }
+            ]
+        },
+        {
+            "module": "module.child",
+            "mode": "managed",
+            "type": "null_resource",
+            "name": "foo",
+            "provider": "provider.null",
+            "instances": [
+                {
+                    "attributes_flat": {
+                        "id": "1361",
+                        "triggers.%": "0"
+                    },
+                    "schema_version": 0
+                }
+            ]
+        }
+    ]
+}
diff --git a/states/statefile/version2.go b/states/statefile/version2.go
index 6fe2ab8ef8ac..be93924a7a80 100644
--- a/states/statefile/version2.go
+++ b/states/statefile/version2.go
@@ -205,5 +205,5 @@ type instanceStateV2 struct {
 type backendStateV2 struct {
 	Type      string          `json:"type"`   // Backend type
 	ConfigRaw json.RawMessage `json:"config"` // Backend raw config
-	Hash      int             `json:"hash"`   // Hash of portion of configuration from config files
+	Hash      uint64          `json:"hash"`   // Hash of portion of configuration from config files
 }