diff --git a/services/core/java/com/android/server/display/PersistentDataStore.java b/services/core/java/com/android/server/display/PersistentDataStore.java
index 4b93d8f42da39..59daee9ea2ff5 100644
--- a/services/core/java/com/android/server/display/PersistentDataStore.java
+++ b/services/core/java/com/android/server/display/PersistentDataStore.java
@@ -463,6 +463,7 @@ final class PersistentDataStore {
 
             TypedXmlSerializer serializer = Xml.resolveSerializer(os);
             saveToXml(serializer);
+            serializer.flush();
 
             mHandler.removeCallbacksAndMessages(/* token */ null);
             mHandler.post(() -> {
@@ -481,8 +482,6 @@ final class PersistentDataStore {
                     }
                 }
             });
-
-            serializer.flush();
         } catch (IOException ex) {
             Slog.w(TAG, "Failed to process the XML serializer.", ex);
         }