diff --git a/src/main/java/com/sparrowwallet/sparrow/io/Config.java b/src/main/java/com/sparrowwallet/sparrow/io/Config.java
index d5eee569..2ea4b518 100644
--- a/src/main/java/com/sparrowwallet/sparrow/io/Config.java
+++ b/src/main/java/com/sparrowwallet/sparrow/io/Config.java
@@ -277,12 +277,13 @@ public class Config {
         flush();
     }
 
-    private void flush() {
+    private synchronized void flush() {
         Gson gson = getGson();
         try {
             File configFile = getConfigFile();
             Writer writer = new FileWriter(configFile);
             gson.toJson(this, writer);
+            writer.flush();
             writer.close();
         } catch (IOException e) {
             //Ignore