diff --git a/dubbo-config/dubbo-config-api/src/main/java/org/apache/dubbo/config/bootstrap/DubboBootstrap.java b/dubbo-config/dubbo-config-api/src/main/java/org/apache/dubbo/config/bootstrap/DubboBootstrap.java
index 7f371fab513..a70eab3b222 100644
--- a/dubbo-config/dubbo-config-api/src/main/java/org/apache/dubbo/config/bootstrap/DubboBootstrap.java
+++ b/dubbo-config/dubbo-config-api/src/main/java/org/apache/dubbo/config/bootstrap/DubboBootstrap.java
@@ -549,7 +549,7 @@ public ReferenceConfigCache getCache() {
     /**
      * Initialize
      */
-    public void initialize() {
+    public synchronized void initialize() {
         if (!initialized.compareAndSet(false, true)) {
             return;
         }