diff --git a/src/zcl_excel_drawing.clas.abap b/src/zcl_excel_drawing.clas.abap
index 7bba684..d1a1f73 100644
--- a/src/zcl_excel_drawing.clas.abap
+++ b/src/zcl_excel_drawing.clas.abap
@@ -125,7 +125,7 @@ CLASS zcl_excel_drawing DEFINITION
         !ip_ref TYPE REF TO zcl_excel_drawing.
     METHODS get_reference_guid
       RETURNING
-        VALUE(ep_guid) TYPE REF TO zexcel_guid.
+        VALUE(ep_guid) TYPE zexcel_guid.
   PROTECTED SECTION.
   PRIVATE SECTION.