diff --git a/builtin.h b/builtin.h
index 8e377522fe..95116b8535 100644
--- a/builtin.h
+++ b/builtin.h
@@ -21,7 +21,6 @@ struct fmt_merge_msg_opts {
 
 extern int fmt_merge_msg(struct strbuf *in, struct strbuf *out,
 			 struct fmt_merge_msg_opts *);
-extern void commit_notes(struct notes_tree *t, const char *msg);
 
 struct notes_rewrite_cfg {
 	struct notes_tree **trees;
@@ -33,7 +32,6 @@ struct notes_rewrite_cfg {
 	int mode_from_env;
 };
 
-combine_notes_fn parse_combine_notes_fn(const char *v);
 struct notes_rewrite_cfg *init_copy_notes_for_rewrite(const char *cmd);
 int copy_note_for_rewrite(struct notes_rewrite_cfg *c,
 			  const unsigned char *from_obj, const unsigned char *to_obj);
diff --git a/builtin/notes.c b/builtin/notes.c
index 554c80167c..453457adb9 100644
--- a/builtin/notes.c
+++ b/builtin/notes.c
@@ -19,6 +19,9 @@
 #include "string-list.h"
 #include "notes-merge.h"
 
+static void commit_notes(struct notes_tree *t, const char *msg);
+static combine_notes_fn parse_combine_notes_fn(const char *v);
+
 static const char * const git_notes_usage[] = {
 	N_("git notes [--ref <notes_ref>] [list [<object>]]"),
 	N_("git notes [--ref <notes_ref>] add [-f] [-m <msg> | -F <file> | (-c | -C) <object>] [<object>]"),
@@ -288,7 +291,7 @@ static int parse_reedit_arg(const struct option *opt, const char *arg, int unset
 	return parse_reuse_arg(opt, arg, unset);
 }
 
-void commit_notes(struct notes_tree *t, const char *msg)
+static void commit_notes(struct notes_tree *t, const char *msg)
 {
 	struct strbuf buf = STRBUF_INIT;
 	unsigned char commit_sha1[20];
@@ -312,7 +315,7 @@ void commit_notes(struct notes_tree *t, const char *msg)
 	strbuf_release(&buf);
 }
 
-combine_notes_fn parse_combine_notes_fn(const char *v)
+static combine_notes_fn parse_combine_notes_fn(const char *v)
 {
 	if (!strcasecmp(v, "overwrite"))
 		return combine_notes_overwrite;