diff --git a/src/lib-storage/mail-storage-settings.c b/src/lib-storage/mail-storage-settings.c
index 15c92fb993..6728d121fd 100644
--- a/src/lib-storage/mail-storage-settings.c
+++ b/src/lib-storage/mail-storage-settings.c
@@ -514,8 +514,6 @@ static bool mail_storage_settings_check(void *_set, pool_t pool,
 
 			if (strcmp(opt, "add-flags-on-save") == 0) {
 				set->parsed_mail_attachment_detection_add_flags_on_save = TRUE;
-			} else if (strcmp(opt, "add-flags-on-fetch") == 0) {
-				set->parsed_mail_attachment_detection_add_flags_on_fetch = TRUE;
 			} else if (strcmp(opt, "exclude-inlined") == 0) {
 				set->parsed_mail_attachment_exclude_inlined = TRUE;
 			} else if (strncmp(opt, "content-type=", 13) == 0) {
diff --git a/src/lib-storage/mail-storage-settings.h b/src/lib-storage/mail-storage-settings.h
index 1b2dd07148..d15e8a300f 100644
--- a/src/lib-storage/mail-storage-settings.h
+++ b/src/lib-storage/mail-storage-settings.h
@@ -69,7 +69,6 @@ struct mail_storage_settings {
 	const char *const *parsed_mail_attachment_content_type_filter;
 	bool parsed_mail_attachment_exclude_inlined;
 	bool parsed_mail_attachment_detection_add_flags_on_save;
-	bool parsed_mail_attachment_detection_add_flags_on_fetch;
 };
 
 struct mail_namespace_settings {