diff --git a/models/workflows.model b/models/workflows.model
index 630e7ff07..011997038 100644
--- a/models/workflows.model
+++ b/models/workflows.model
@@ -5,7 +5,7 @@ WorkflowDefinition
     UniqueWorkflowDefinition name scope
 
 WorkflowInstance
-    definition  WorkflowDefinition
+    definition  WorkflowDefinitionId
     graph       (WorkflowGraph SqlBackendKey SqlBackendKey)  -- FileId, UserId
     scope       (WorkflowInstanceScope SqlBackendKey SqlBackendKey SqlBackendKey)  -- TermId, SchoolId, CourseId
     name        (CI Text)
@@ -13,7 +13,7 @@ WorkflowInstance
     UniqueWorkflowInstance name scope
 
 WorkflowWorkflow
-    instance    WorkflowInstance
+    instance    WorkflowInstanceId
     graph       (WorkflowGraph SqlBackendKey SqlBackendKey)  -- FileId, UserId
     initUser    UserId Maybe
     initTime    UTCTime