diff --git a/druid-spring-boot-example/druid-spring-boot-mybatis-example/src/main/java/com/github/trang/druid/example/config/DynamicDataSource.java b/druid-spring-boot-example/druid-spring-boot-mybatis-example/src/main/java/com/github/trang/druid/example/config/DynamicDataSource.java
index 3c6e573..12f2e31 100644
--- a/druid-spring-boot-example/druid-spring-boot-mybatis-example/src/main/java/com/github/trang/druid/example/config/DynamicDataSource.java
+++ b/druid-spring-boot-example/druid-spring-boot-mybatis-example/src/main/java/com/github/trang/druid/example/config/DynamicDataSource.java
@@ -18,11 +18,9 @@ import java.util.concurrent.atomic.AtomicInteger;
 public class DynamicDataSource extends AbstractRoutingDataSource {
 
     private AtomicInteger count = new AtomicInteger();
-    private DataSource defaultTargetDataSource;
     @Getter private Map<String, DataSource> targetDataSources;
 
-    public DynamicDataSource(DataSource defaultTargetDataSource, Map<String, DataSource> targetDataSources) {
-        this.defaultTargetDataSource = defaultTargetDataSource;
+    public DynamicDataSource(Map<String, DataSource> targetDataSources) {
         this.targetDataSources = targetDataSources;
     }
 
@@ -35,7 +33,6 @@ public class DynamicDataSource extends AbstractRoutingDataSource {
 
     @Override
     public void afterPropertiesSet() {
-        super.setDefaultTargetDataSource(defaultTargetDataSource);
         super.setTargetDataSources(new HashMap<>(targetDataSources));
         super.afterPropertiesSet();
     }
diff --git a/druid-spring-boot-example/druid-spring-boot-mybatis-example/src/main/java/com/github/trang/druid/example/config/SpringDataSourceConfig.java b/druid-spring-boot-example/druid-spring-boot-mybatis-example/src/main/java/com/github/trang/druid/example/config/SpringDataSourceConfig.java
index 038abf4..f2aabac 100644
--- a/druid-spring-boot-example/druid-spring-boot-mybatis-example/src/main/java/com/github/trang/druid/example/config/SpringDataSourceConfig.java
+++ b/druid-spring-boot-example/druid-spring-boot-mybatis-example/src/main/java/com/github/trang/druid/example/config/SpringDataSourceConfig.java
@@ -31,7 +31,7 @@ public class SpringDataSourceConfig {
     @Primary
     public DynamicDataSource dataSource(Map<String, DruidDataSource> druidDataSourceMap) {
         Map<String, DataSource> dataSourceMap = new HashMap<>(druidDataSourceMap);
-        return new DynamicDataSource(dataSourceMap.get("master"), dataSourceMap);
+        return new DynamicDataSource(dataSourceMap);
     }
 
 }
\ No newline at end of file