diff --git a/src/eval.c b/src/eval.c
index 3564617..a17d743 100644
--- a/src/eval.c
+++ b/src/eval.c
@@ -12135,6 +12135,9 @@
 #ifdef FEAT_TOOLBAR
 	"toolbar",
 #endif
+#if defined(FEAT_CLIPBOARD) && defined(FEAT_X11)
+	"unnamedplus",
+#endif
 #ifdef FEAT_USR_CMDS
 	"user-commands",    /* was accidentally included in 5.4 */
 	"user_commands",