diff --git a/diff.c b/diff.c
index 2d0b5e3..78819ba 100644
--- a/diff.c
+++ b/diff.c
@@ -3570,6 +3570,14 @@
 	return 0;
 }
 
+/* Used only by "diff-files" and "diff --no-index" */
+void handle_deprecated_show_diff_q(struct diff_options *opt)
+{
+	warning("'diff -q' and 'diff-files -q' are deprecated.");
+	warning("Use 'diff --diff-filter=d' instead to ignore deleted filepairs.");
+	parse_diff_filter_opt("d", opt);
+}
+
 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
 {
 	const char *arg = av[0];