diff --git a/builtin/log.c b/builtin/log.c
index f249aca049..b76a1c82d8 100644
--- a/builtin/log.c
+++ b/builtin/log.c
@@ -1371,7 +1371,7 @@ static void make_cover_letter(struct rev_info *rev, int use_separate_file,
 			.other_arg = &other_arg
 		};
 
-		diff_setup(&opts);
+		repo_diff_setup(the_repository, &opts);
 		opts.file = rev->diffopt.file;
 		opts.use_color = rev->diffopt.use_color;
 		diff_setup_done(&opts);
diff --git a/builtin/rebase.c b/builtin/rebase.c
index eba48bffaa..76cce94373 100644
--- a/builtin/rebase.c
+++ b/builtin/rebase.c
@@ -1786,7 +1786,7 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
 		}
 
 		/* We want color (if set), but no pager */
-		diff_setup(&opts);
+		repo_diff_setup(the_repository, &opts);
 		opts.stat_width = -1; /* use full terminal width */
 		opts.stat_graph_width = -1; /* respect statGraphWidth config */
 		opts.output_format |=
diff --git a/builtin/stash.c b/builtin/stash.c
index ed1275829e..6c062e5204 100644
--- a/builtin/stash.c
+++ b/builtin/stash.c
@@ -427,7 +427,7 @@ static void unstage_changes_unless_new(struct object_id *orig_tree)
 	 * to the index before a merge was run) and the current index
 	 * (reflecting the changes brought in by the merge).
 	 */
-	diff_setup(&diff_opts);
+	repo_diff_setup(the_repository, &diff_opts);
 	diff_opts.flags.recursive = 1;
 	diff_opts.detect_rename = 0;
 	diff_opts.output_format = DIFF_FORMAT_NO_OUTPUT;
diff --git a/contrib/coccinelle/the_repository.cocci b/contrib/coccinelle/the_repository.cocci
index 0cdf3f4630..3c0bd8781e 100644
--- a/contrib/coccinelle/the_repository.cocci
+++ b/contrib/coccinelle/the_repository.cocci
@@ -73,6 +73,10 @@
 |
 - get_commit_tree
 + repo_get_commit_tree
+// diff.h
+|
+- diff_setup
++ repo_diff_setup
 )
   (
 + the_repository,
diff --git a/contrib/coccinelle/the_repository.pending.cocci b/contrib/coccinelle/the_repository.pending.cocci
index bf19e6a248..00461ee86b 100644
--- a/contrib/coccinelle/the_repository.pending.cocci
+++ b/contrib/coccinelle/the_repository.pending.cocci
@@ -5,11 +5,7 @@
 @@
 @@
 (
-// diff.h
-- diff_setup
-+ repo_diff_setup
 // object-store.h
-|
 - read_object_file
 + repo_read_object_file
 |
diff --git a/diff.h b/diff.h
index 8d770b1d57..8b510eb579 100644
--- a/diff.h
+++ b/diff.h
@@ -535,9 +535,6 @@ int git_diff_basic_config(const char *var, const char *value, void *cb);
 int git_diff_heuristic_config(const char *var, const char *value, void *cb);
 void init_diff_ui_defaults(void);
 int git_diff_ui_config(const char *var, const char *value, void *cb);
-#ifndef NO_THE_REPOSITORY_COMPATIBILITY_MACROS
-#define diff_setup(diffopts) repo_diff_setup(the_repository, diffopts)
-#endif
 void repo_diff_setup(struct repository *, struct diff_options *);
 struct option *add_diff_options(const struct option *, struct diff_options *);
 int diff_opt_parse(struct diff_options *, const char **, int, const char *);
diff --git a/log-tree.c b/log-tree.c
index 4bebb86eca..1bd4d6ab00 100644
--- a/log-tree.c
+++ b/log-tree.c
@@ -849,7 +849,7 @@ void show_log(struct rev_info *opt)
 		 * Pass minimum required diff-options to range-diff; others
 		 * can be added later if deemed desirable.
 		 */
-		diff_setup(&opts);
+		repo_diff_setup(the_repository, &opts);
 		opts.file = opt->diffopt.file;
 		opts.use_color = opt->diffopt.use_color;
 		diff_setup_done(&opts);
diff --git a/range-diff.c b/range-diff.c
index 5bcf966f6c..15d0bc35a8 100644
--- a/range-diff.c
+++ b/range-diff.c
@@ -485,7 +485,7 @@ static void output(struct string_list *a, struct string_list *b,
 	if (range_diff_opts->diffopt)
 		memcpy(&opts, range_diff_opts->diffopt, sizeof(opts));
 	else
-		diff_setup(&opts);
+		repo_diff_setup(the_repository, &opts);
 
 	opts.no_free = 1;
 	if (!opts.output_format)