diff --git a/diff-lib.c b/diff-lib.c
index ec5f722eff..044872935c 100644
--- a/diff-lib.c
+++ b/diff-lib.c
@@ -91,9 +91,6 @@ int run_diff_files(struct rev_info *revs, unsigned int option)
 	unsigned ce_option = ((option & DIFF_RACY_IS_MODIFIED)
 			      ? CE_MATCH_RACY_IS_DIRTY : 0);
 
-	if (option & DIFF_SILENT_ON_REMOVED)
-		handle_deprecated_show_diff_q(&revs->diffopt);
-
 	diff_set_mnemonic_prefix(&revs->diffopt, "i/", "w/");
 
 	if (diff_unmerged_stage < 0)
diff --git a/diff-no-index.c b/diff-no-index.c
index 33e5982a1c..8e10bff30e 100644
--- a/diff-no-index.c
+++ b/diff-no-index.c
@@ -186,7 +186,6 @@ void diff_no_index(struct rev_info *revs,
 		   const char *prefix)
 {
 	int i, prefixlen;
-	unsigned deprecated_show_diff_q_option_used = 0;
 	const char *paths[2];
 
 	diff_setup(&revs->diffopt);
@@ -194,10 +193,6 @@ void diff_no_index(struct rev_info *revs,
 		int j;
 		if (!strcmp(argv[i], "--no-index"))
 			i++;
-		else if (!strcmp(argv[i], "-q")) {
-			deprecated_show_diff_q_option_used = 1;
-			i++;
-		}
 		else if (!strcmp(argv[i], "--"))
 			i++;
 		else {
@@ -230,9 +225,6 @@ void diff_no_index(struct rev_info *revs,
 	revs->max_count = -2;
 	diff_setup_done(&revs->diffopt);
 
-	if (deprecated_show_diff_q_option_used)
-		handle_deprecated_show_diff_q(&revs->diffopt);
-
 	setup_diff_pager(&revs->diffopt);
 	DIFF_OPT_SET(&revs->diffopt, EXIT_WITH_STATUS);
 
diff --git a/diff.c b/diff.c
index e8006666d8..7c59bfe2d0 100644
--- a/diff.c
+++ b/diff.c
@@ -3599,14 +3599,6 @@ static int parse_diff_filter_opt(const char *optarg, struct diff_options *opt)
 	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);
-}
-
 static void enable_patch_output(int *fmt) {
 	*fmt &= ~DIFF_FORMAT_NO_OUTPUT;
 	*fmt |= DIFF_FORMAT_PATCH;
diff --git a/diff.h b/diff.h
index e79f3b3ff0..a24a767db7 100644
--- a/diff.h
+++ b/diff.h
@@ -345,8 +345,6 @@ extern int parse_rename_score(const char **cp_p);
 
 extern long parse_algorithm_value(const char *value);
 
-extern void handle_deprecated_show_diff_q(struct diff_options *);
-
 extern int print_stat_summary(FILE *fp, int files,
 			      int insertions, int deletions);
 extern void setup_diff_pager(struct diff_options *);