diff --git a/src/zcl_excel_writer_csv.clas.abap b/src/zcl_excel_writer_csv.clas.abap
index 654cf2a..c2fad87 100644
--- a/src/zcl_excel_writer_csv.clas.abap
+++ b/src/zcl_excel_writer_csv.clas.abap
@@ -7,7 +7,7 @@ CLASS zcl_excel_writer_csv DEFINITION
 *"* do not include other source files here!!!
 *"* protected components of class ZCL_EXCEL_WRITER_2007
 *"* do not include other source files here!!!
-public section.
+PUBLIC SECTION.
 
   interfaces ZIF_EXCEL_WRITER .