diff --git a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/net/TestScriptBasedMapping.java b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/net/TestScriptBasedMapping.java
index 0d0d5b15cd181..356cb707c2a04 100644
--- a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/net/TestScriptBasedMapping.java
+++ b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/net/TestScriptBasedMapping.java
@@ -36,7 +36,6 @@ public void testNoArgsMeansNoResult() {
     conf.setInt(ScriptBasedMapping.SCRIPT_ARG_COUNT_KEY,
                 ScriptBasedMapping.MIN_ALLOWABLE_ARGS - 1);
     conf.set(ScriptBasedMapping.SCRIPT_FILENAME_KEY, "any-filename");
-    conf.set(ScriptBasedMapping.SCRIPT_FILENAME_KEY, "any-filename");
     ScriptBasedMapping mapping = createMapping(conf);
     List<String> names = new ArrayList<String>();
     names.add("some.machine.name");