diff --git a/src/globals.h b/src/globals.h
index 573dc98..4b916ef 100644
--- a/src/globals.h
+++ b/src/globals.h
@@ -1418,7 +1418,10 @@
 EXTERN char_u e_invalpat[]	INIT(= N_("E682: Invalid search pattern or delimiter"));
 #endif
 EXTERN char_u e_bufloaded[]	INIT(= N_("E139: File is loaded in another buffer"));
+#if defined(FEAT_SYN_HL) || \
+	(defined(FEAT_INS_EXPAND) && defined(FEAT_COMPL_FUNC))
 EXTERN char_u e_notset[]	INIT(= N_("E764: Option '%s' is not set"));
+#endif
 
 #ifdef MACOS_X_UNIX
 EXTERN short disallow_gui	INIT(= FALSE);