diff --git a/src/errors.h b/src/errors.h
index 14c5b8d..d4f3179 100644
--- a/src/errors.h
+++ b/src/errors.h
@@ -494,3 +494,5 @@
 	INIT(= N_("E1205: No white space allowed between option and"));
 EXTERN char e_dict_required_for_argument_nr[]
 	INIT(= N_("E1206: Dictionary required for argument %d"));
+EXTERN char e_expression_without_effect_str[]
+	INIT(= N_("E1207: Expression without an effect: %s"));