diff --git a/tajo-core-tests/src/test/java/org/apache/tajo/engine/function/TestStringOperatorsAndFunctions.java b/tajo-core-tests/src/test/java/org/apache/tajo/engine/function/TestStringOperatorsAndFunctions.java
index a38eb71858..e266409d67 100644
--- a/tajo-core-tests/src/test/java/org/apache/tajo/engine/function/TestStringOperatorsAndFunctions.java
+++ b/tajo-core-tests/src/test/java/org/apache/tajo/engine/function/TestStringOperatorsAndFunctions.java
@@ -639,5 +639,11 @@ public void testConcat_ws() throws TajoException {
     testSimpleEval("select concat_ws(',', '22', null) ", new String[]{"22"});
     testSimpleEval("select concat_ws(',', '22', '33', '33') ", new String[]{"22,33,33"});
     testSimpleEval("select concat_ws(',', null, '22') ", new String[]{"22"});
+
+    testSimpleEval("select concat_ws('\t', '333', '22') ", new String[]{"333\t22"});
+    testSimpleEval("select concat_ws('\t', '한글', '22') ", new String[]{"한글\t22"});
+    testSimpleEval("select concat_ws('\t', '22', null) ", new String[]{"22"});
+    testSimpleEval("select concat_ws('\t', '22', '33', '33') ", new String[]{"22\t33\t33"});
+    testSimpleEval("select concat_ws('\t', null, '22') ", new String[]{"22"});
   }
 }
diff --git a/tajo-core/src/main/java/org/apache/tajo/engine/function/string/Concat_ws.java b/tajo-core/src/main/java/org/apache/tajo/engine/function/string/Concat_ws.java
index bbddeb16d6..c160f24738 100644
--- a/tajo-core/src/main/java/org/apache/tajo/engine/function/string/Concat_ws.java
+++ b/tajo-core/src/main/java/org/apache/tajo/engine/function/string/Concat_ws.java
@@ -19,6 +19,7 @@
 package org.apache.tajo.engine.function.string;
 
 import com.google.gson.annotations.Expose;
+import org.apache.commons.lang.StringEscapeUtils;
 import org.apache.tajo.catalog.Column;
 import org.apache.tajo.common.TajoDataTypes;
 import org.apache.tajo.datum.Datum;
@@ -60,7 +61,7 @@ public Datum eval(Tuple params) {
       return NullDatum.get();
     }
 
-    String separator = params.getText(0);
+    String separator = StringEscapeUtils.unescapeJava(params.getText(0));
 
     StringBuilder result = new StringBuilder();