diff --git a/flink-libraries/flink-cep/src/test/java/org/apache/flink/cep/nfa/NFATest.java b/flink-libraries/flink-cep/src/test/java/org/apache/flink/cep/nfa/NFATest.java
index 25863423fbc00fd0d1105954a01037770bb6c4e6..8e739c316dd8d7b59bafef0f868d6579f8aa2e12 100644
--- a/flink-libraries/flink-cep/src/test/java/org/apache/flink/cep/nfa/NFATest.java
+++ b/flink-libraries/flink-cep/src/test/java/org/apache/flink/cep/nfa/NFATest.java
@@ -29,10 +29,10 @@ import org.apache.flink.core.memory.DataOutputViewStreamWrapper;
 import org.apache.flink.streaming.runtime.streamrecord.StreamRecord;
 import org.apache.flink.util.TestLogger;
 
-import org.apache.commons.io.output.ByteArrayOutputStream;
 import org.junit.Test;
 
 import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Collection;