diff --git a/src/zcl_excel_worksheet.clas.abap b/src/zcl_excel_worksheet.clas.abap
index 5cb1ce0..9e54535 100644
--- a/src/zcl_excel_worksheet.clas.abap
+++ b/src/zcl_excel_worksheet.clas.abap
@@ -3453,26 +3453,17 @@ CLASS zcl_excel_worksheet IMPLEMENTATION.
 
   METHOD normalize_style_parameter.
 
-    DATA: lo_style_type TYPE REF TO cl_abap_typedescr.
-    FIELD-SYMBOLS:
-      <style> TYPE REF TO zcl_excel_style.
+    DATA lo_style_type TYPE REF TO cl_abap_typedescr.
+    FIELD-SYMBOLS <style> TYPE REF TO zcl_excel_style.
 
     CHECK ip_style_or_guid IS NOT INITIAL.
 
     lo_style_type = cl_abap_typedescr=>describe_by_data( ip_style_or_guid ).
     IF lo_style_type->type_kind = lo_style_type->typekind_oref.
-      lo_style_type = cl_abap_typedescr=>describe_by_object_ref( ip_style_or_guid ).
-      IF lo_style_type->absolute_name = '\CLASS=ZCL_EXCEL_STYLE'.
-        ASSIGN ip_style_or_guid TO <style>.
-        rv_guid = <style>->get_guid( ).
-      ENDIF.
-
-    ELSEIF lo_style_type->absolute_name = '\TYPE=ZEXCEL_CELL_STYLE'.
-      rv_guid = ip_style_or_guid.
-
+      ASSIGN ip_style_or_guid TO <style>.
+      rv_guid = <style>->get_guid( ).
     ELSEIF lo_style_type->type_kind = lo_style_type->typekind_hex.
       rv_guid = ip_style_or_guid.
-
     ELSE.
       RAISE EXCEPTION TYPE zcx_excel EXPORTING error = 'IP_GUID type must be either REF TO zcl_excel_style or zexcel_cell_style'.
     ENDIF.