diff --git a/src/evalfunc.c b/src/evalfunc.c
index 74afd9d..76955a7 100644
--- a/src/evalfunc.c
+++ b/src/evalfunc.c
@@ -7415,6 +7415,13 @@
 		0
 #endif
 		},
+	{"tabpanel",
+#if defined(FEAT_TABPANEL)
+		1,
+#else
+		0,
+#endif
+	},
 	{"tag_binary", 1},	// graduated feature
 	{"tcl",
 #if defined(FEAT_TCL) && !defined(DYNAMIC_TCL)