diff --git a/src/zcl_excel_writer_csv.clas.abap b/src/zcl_excel_writer_csv.clas.abap
index b8b0b23..db801f5 100644
--- a/src/zcl_excel_writer_csv.clas.abap
+++ b/src/zcl_excel_writer_csv.clas.abap
@@ -32,7 +32,7 @@ CLASS zcl_excel_writer_csv DEFINITION
   PROTECTED SECTION.
 *"* private components of class ZCL_EXCEL_WRITER_CSV
 *"* do not include other source files here!!!
-  private section.
+  PRIVATE SECTION.
 
     data EXCEL type ref to ZCL_EXCEL .
     class-data DELIMITER type C value ';' ##NO_TEXT.