diff --git a/metafacture-csv/src/main/java/org/metafacture/csv/CsvEncoder.java b/metafacture-csv/src/main/java/org/metafacture/csv/CsvEncoder.java
index f2f91db49..513884dd0 100644
--- a/metafacture-csv/src/main/java/org/metafacture/csv/CsvEncoder.java
+++ b/metafacture-csv/src/main/java/org/metafacture/csv/CsvEncoder.java
@@ -183,8 +183,7 @@ public void startRecord(final String identifier) {
     public void endRecord() {
         if (isFirstRecord) {
             if (includeHeader) {
-                final List<String> uniqueHeader = header.stream().distinct().collect(Collectors.toList());
-                writeRow(uniqueHeader);
+                writeRow(header);
                 header.clear();
             }
             isFirstRecord = false;