diff --git a/src/structs.h b/src/structs.h
index 00b0746..30e20c5 100644
--- a/src/structs.h
+++ b/src/structs.h
@@ -4566,6 +4566,7 @@
     char_u	*pum_info;		// extra info
     int		pum_score;		// fuzzy match score
     int		pum_idx;		// index of item before sorting by score
+    int		pum_cpt_source_idx;	// index of completion source in 'cpt'
     int		pum_user_abbr_hlattr;	// highlight attribute for abbr
     int		pum_user_kind_hlattr;	// highlight attribute for kind
 } pumitem_T;