diff --git a/src/main/java/com/alibaba/druid/pool/PoolableWrapper.java b/src/main/java/com/alibaba/druid/pool/PoolableWrapper.java
index a506430827..cd73078fd3 100644
--- a/src/main/java/com/alibaba/druid/pool/PoolableWrapper.java
+++ b/src/main/java/com/alibaba/druid/pool/PoolableWrapper.java
@@ -23,10 +23,10 @@ import java.sql.Wrapper;
  */
 public class PoolableWrapper implements Wrapper {
 
-    private final Wrapper wraaper;
+    private final Wrapper wrapper;
 
     public PoolableWrapper(Wrapper wraaper){
-        this.wraaper = wraaper;
+        this.wrapper = wraaper;
     }
 
     @Override
@@ -39,11 +39,7 @@ public class PoolableWrapper implements Wrapper {
             return true;
         }
 
-        if (iface.isInstance(wraaper)) {
-            return true;
-        }
-
-        return wraaper.isWrapperFor(iface);
+        return wrapper.isWrapperFor(iface);
     }
 
     @SuppressWarnings("unchecked")
@@ -57,11 +53,7 @@ public class PoolableWrapper implements Wrapper {
             return (T) this;
         }
 
-        if (iface.isInstance(wraaper)) {
-            return (T) wraaper;
-        }
-
-        return wraaper.unwrap(iface);
+        return wrapper.unwrap(iface);
     }
 
 }
diff --git a/src/test/java/com/alibaba/druid/bvt/pool/basic/PoolableWrapperTest.java b/src/test/java/com/alibaba/druid/bvt/pool/basic/PoolableWrapperTest.java
new file mode 100644
index 0000000000..dc24e92db4
--- /dev/null
+++ b/src/test/java/com/alibaba/druid/bvt/pool/basic/PoolableWrapperTest.java
@@ -0,0 +1,18 @@
+package com.alibaba.druid.bvt.pool.basic;
+
+import junit.framework.Assert;
+import junit.framework.TestCase;
+
+import com.alibaba.druid.mock.MockConnection;
+import com.alibaba.druid.pool.PoolableWrapper;
+
+
+public class PoolableWrapperTest extends TestCase {
+    public void test_isWrapper() throws Exception {
+        PoolableWrapper wrapper = new PoolableWrapper(new MockConnection());
+        
+        Assert.assertEquals(false, wrapper.isWrapperFor(null));
+        Assert.assertEquals(true, wrapper.isWrapperFor(PoolableWrapper.class));
+        Assert.assertEquals(true, wrapper.isWrapperFor(MockConnection.class));
+    }
+}