diff --git a/harbour/include/hbapi.h b/harbour/include/hbapi.h
index 1a767700f5..42576103d3 100644
--- a/harbour/include/hbapi.h
+++ b/harbour/include/hbapi.h
@@ -200,6 +200,8 @@ struct hb_struString
 {
    ULONG length;
    char * value;
+   BOOL bPcode;         /* it is a string created from the pcode */
+   USHORT * puiHolders; /* number of holders of this string */
 };
 
 struct hb_struSymbol
@@ -597,4 +599,4 @@ extern char * hb_getenv( const char * name );
 }
 #endif
 
-#endif /* HB_APIEXT_H_ */
+#endif /* HB_APIEXT_H_ */
\ No newline at end of file