diff --git a/moto/swf/models/workflow_execution.py b/moto/swf/models/workflow_execution.py
index f53c1028..c22d3e02 100644
--- a/moto/swf/models/workflow_execution.py
+++ b/moto/swf/models/workflow_execution.py
@@ -286,7 +286,7 @@ class WorkflowExecution(object):
         # handle each decision separately, in order
         for decision in decisions:
             decision_type = decision["decisionType"]
-            attributes_key = "{}EventAttributes".format(decapitalize(decision_type))
+            attributes_key = "{}DecisionAttributes".format(decapitalize(decision_type))
             attributes = decision.get(attributes_key, {})
             if decision_type == "CompleteWorkflowExecution":
                 self.complete(event_id, attributes.get("result"))
diff --git a/tests/test_swf/test_decision_tasks.py b/tests/test_swf/test_decision_tasks.py
index 6ccd0780..a07eecbf 100644
--- a/tests/test_swf/test_decision_tasks.py
+++ b/tests/test_swf/test_decision_tasks.py
@@ -144,7 +144,7 @@ def test_respond_decision_task_completed_with_complete_workflow_execution():
 
     decisions = [{
         "decisionType": "CompleteWorkflowExecution",
-        "completeWorkflowExecutionEventAttributes": {"result": "foo bar"}
+        "completeWorkflowExecutionDecisionAttributes": {"result": "foo bar"}
     }]
     resp = conn.respond_decision_task_completed(task_token, decisions=decisions)
     resp.should.be.none
@@ -240,7 +240,7 @@ def test_respond_decision_task_completed_with_fail_workflow_execution():
 
     decisions = [{
         "decisionType": "FailWorkflowExecution",
-        "failWorkflowExecutionEventAttributes": {"reason": "my rules", "details": "foo"}
+        "failWorkflowExecutionDecisionAttributes": {"reason": "my rules", "details": "foo"}
     }]
     resp = conn.respond_decision_task_completed(task_token, decisions=decisions)
     resp.should.be.none