diff --git a/rally/api.py b/rally/api.py
index 9914c54501..2ee0cb6425 100644
--- a/rally/api.py
+++ b/rally/api.py
@@ -253,8 +253,6 @@ class _Deployment(APIGroup):
 
 class _Task(APIGroup):
 
-    TASK_RESULT_SCHEMA = objects.task.TASK_RESULT_SCHEMA
-
     def list(self, **filters):
         return [task.to_dict() for task in objects.Task.list(**filters)]
 
diff --git a/rally/cli/commands/task.py b/rally/cli/commands/task.py
index 784c588139..4679726a25 100644
--- a/rally/cli/commands/task.py
+++ b/rally/cli/commands/task.py
@@ -49,6 +49,81 @@ from rally.task import utils as tutils
 
 LOG = logging.getLogger(__name__)
 
+OLD_TASK_RESULT_SCHEMA = {
+    "type": "object",
+    "$schema": consts.JSON_SCHEMA,
+    "properties": {
+        "key": {
+            "type": "object",
+            "properties": {
+                "kw": {
+                    "type": "object"
+                },
+                "name": {
+                    "type": "string"
+                },
+                "pos": {
+                    "type": "integer"
+                },
+            },
+            "required": ["kw", "name", "pos"]
+        },
+        "sla": {
+            "type": "array",
+            "items": {
+                "type": "object",
+                "properties": {
+                    "criterion": {
+                        "type": "string"
+                    },
+                    "detail": {
+                        "type": "string"
+                    },
+                    "success": {
+                        "type": "boolean"
+                    }
+                }
+            }
+        },
+        "hooks": {"type": "array"},
+        "result": {
+            "type": "array",
+            "items": {
+                "type": "object",
+                "properties": {
+                    "atomic_actions": {
+                        "type": "object"
+                    },
+                    "duration": {
+                        "type": "number"
+                    },
+                    "error": {
+                        "type": "array"
+                    },
+                    "idle_duration": {
+                        "type": "number"
+                    },
+                    "output": {"type": "object"}
+                },
+                "required": ["atomic_actions", "duration", "error",
+                             "idle_duration"]
+            },
+            "minItems": 1
+        },
+        "load_duration": {
+            "type": "number",
+        },
+        "full_duration": {
+            "type": "number",
+        },
+        "created_at": {
+            "type": "string"
+        }
+    },
+    "required": ["key", "sla", "result", "load_duration", "full_duration"],
+    "additionalProperties": False
+}
+
 
 class FailedToLoadTask(exceptions.RallyException):
     error_code = 472
@@ -620,7 +695,7 @@ class TaskCommands(object):
             for result in tasks_results:
                 try:
                     jsonschema.validate(
-                        result, api.task.TASK_RESULT_SCHEMA)
+                        result, OLD_TASK_RESULT_SCHEMA)
                 except jsonschema.ValidationError as e:
                     raise FailedToLoadResults(source=task_id,
                                               msg=six.text_type(e))
diff --git a/rally/common/objects/task.py b/rally/common/objects/task.py
index a152b92cfb..66cbb7dcae 100644
--- a/rally/common/objects/task.py
+++ b/rally/common/objects/task.py
@@ -137,96 +137,6 @@ HOOK_RESULTS_SCHEMA = {
     "additionalProperties": False,
 }
 
-TASK_RESULT_SCHEMA = {
-    "type": "object",
-    "$schema": consts.JSON_SCHEMA,
-    "properties": {
-        "key": {
-            "type": "object",
-            "properties": {
-                "kw": {
-                    "type": "object"
-                },
-                "name": {
-                    "type": "string"
-                },
-                "pos": {
-                    "type": "integer"
-                },
-            },
-            "required": ["kw", "name", "pos"]
-        },
-        "sla": {
-            "type": "array",
-            "items": {
-                "type": "object",
-                "properties": {
-                    "criterion": {
-                        "type": "string"
-                    },
-                    "detail": {
-                        "type": "string"
-                    },
-                    "success": {
-                        "type": "boolean"
-                    }
-                }
-            }
-        },
-        "hooks": {"type": "array", "items": HOOK_RESULTS_SCHEMA},
-        "result": {
-            "type": "array",
-            "items": {
-                "type": "object",
-                "properties": {
-                    "atomic_actions": {
-                        # NOTE(chenhb): back compatible, old format is dict
-                        "oneOf": [{"type": "array"},
-                                  {"type": "object"}]
-                    },
-                    "duration": {
-                        "type": "number"
-                    },
-                    "error": {
-                        "type": "array"
-                    },
-                    "idle_duration": {
-                        "type": "number"
-                    },
-                    # NOTE(amaretskiy): "scenario_output" is deprecated
-                    #                   in favor of "output"
-                    "scenario_output": {
-                        "type": "object",
-                        "properties": {
-                            "data": {
-                                "type": "object"
-                            },
-                            "errors": {
-                                "type": "string"
-                            },
-                        },
-                        "required": ["data", "errors"]
-                    },
-                    "output": OUTPUT_SCHEMA
-                },
-                "required": ["atomic_actions", "duration", "error",
-                             "idle_duration"]
-            }
-        },
-        "load_duration": {
-            "type": "number",
-        },
-        "full_duration": {
-            "type": "number",
-        },
-        "created_at": {
-            "type": "string"
-        }
-    },
-    "required": ["key", "sla", "result", "load_duration", "full_duration"],
-    "additionalProperties": False
-}
-
 
 class Task(object):
     """Represents a task object.