diff --git a/src/structs.h b/src/structs.h
index 7fd325a..69233a9 100644
--- a/src/structs.h
+++ b/src/structs.h
@@ -1812,6 +1812,7 @@
     typval_T	*pt_argv;	// arguments in allocated array
 
     dict_T	*pt_dict;	// dict for "self"
+    int		pt_copyID;	// funcstack may contain pointer to partial
 };
 
 typedef struct AutoPatCmd_S AutoPatCmd;