diff --git a/flow-typed/Collections.js b/flow-typed/Collections.js
index 86cd9d01c2..5f0e9ca086 100644
--- a/flow-typed/Collections.js
+++ b/flow-typed/Collections.js
@@ -23,7 +23,7 @@ declare type CollectionState = {
   // -- sync --
   unpublished: CollectionGroup,
   edited: CollectionGroup,
-  unsavedChanges?: CollectionGroup,
+  unsavedChanges: CollectionGroup,
   updated: UpdatedCollectionGroup,
   builtin: CollectionGroup,
   savedIds: Array<string>,
diff --git a/ui/redux/reducers/collections.js b/ui/redux/reducers/collections.js
index 77d5aad41f..cce4d6afe5 100644
--- a/ui/redux/reducers/collections.js
+++ b/ui/redux/reducers/collections.js
@@ -24,6 +24,7 @@ const defaultState: CollectionState = {
   unpublished: {},
   edited: {},
   updated: {},
+  unsavedChanges: {},
   savedIds: [],
   // -- local --
   isFetchingMyCollections: undefined,