diff --git a/builtin/diff-tree.c b/builtin/diff-tree.c
index d62caa6c8b..c9ba35f143 100644
--- a/builtin/diff-tree.c
+++ b/builtin/diff-tree.c
@@ -99,7 +99,7 @@ static const char diff_tree_usage[] =
 "  --root        include the initial commit as diff against /dev/null\n"
 COMMON_DIFF_OPTIONS_HELP;
 
-static void diff_tree_tweak_rev(struct rev_info *rev, struct setup_revision_opt *opt)
+static void diff_tree_tweak_rev(struct rev_info *rev)
 {
 	if (!rev->diffopt.output_format) {
 		if (rev->dense_combined_merges)
diff --git a/builtin/log.c b/builtin/log.c
index 1aca560ec3..96b60c1610 100644
--- a/builtin/log.c
+++ b/builtin/log.c
@@ -719,8 +719,7 @@ static int show_tree_object(const struct object_id *oid UNUSED,
 	return 0;
 }
 
-static void show_setup_revisions_tweak(struct rev_info *rev,
-				       struct setup_revision_opt *opt)
+static void show_setup_revisions_tweak(struct rev_info *rev)
 {
 	if (rev->first_parent_only)
 		diff_merges_default_to_first_parent(rev);
@@ -863,8 +862,7 @@ int cmd_log_reflog(int argc, const char **argv, const char *prefix)
 	return cmd_log_deinit(cmd_log_walk(&rev), &rev);
 }
 
-static void log_setup_revisions_tweak(struct rev_info *rev,
-				      struct setup_revision_opt *opt)
+static void log_setup_revisions_tweak(struct rev_info *rev)
 {
 	if (rev->diffopt.flags.default_follow_renames &&
 	    diff_check_follow_pathspec(&rev->prune_data, 0))
diff --git a/revision.c b/revision.c
index d66857ecc0..ea5ab59654 100644
--- a/revision.c
+++ b/revision.c
@@ -2971,7 +2971,7 @@ int setup_revisions(int argc, const char **argv, struct rev_info *revs, struct s
 	if (!revs->def)
 		revs->def = opt ? opt->def : NULL;
 	if (opt && opt->tweak)
-		opt->tweak(revs, opt);
+		opt->tweak(revs);
 	if (revs->show_merge)
 		prepare_show_merge(revs);
 	if (revs->def && !revs->pending.nr && !revs->rev_input_given) {
diff --git a/revision.h b/revision.h
index 25776af381..18f49565c2 100644
--- a/revision.h
+++ b/revision.h
@@ -428,7 +428,7 @@ void repo_init_revisions(struct repository *r,
  */
 struct setup_revision_opt {
 	const char *def;
-	void (*tweak)(struct rev_info *, struct setup_revision_opt *);
+	void (*tweak)(struct rev_info *);
 	unsigned int	assume_dashdash:1,
 			allow_exclude_promisor_objects:1,
 			free_removed_argv_elements:1;