diff --git a/builtin/am.c b/builtin/am.c
index 5fab159599..cee6d28af6 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -787,7 +787,7 @@ static int split_mail_conv(mail_conv_fn fn, struct am_state *state,
  * A split_mail_conv() callback that converts an StGit patch to an RFC2822
  * message suitable for parsing with git-mailinfo.
  */
-static int stgit_patch_to_mail(FILE *out, FILE *in, int keep_cr)
+static int stgit_patch_to_mail(FILE *out, FILE *in, int keep_cr UNUSED)
 {
 	struct strbuf sb = STRBUF_INIT;
 	int subject_printed = 0;
@@ -870,7 +870,7 @@ static int split_mail_stgit_series(struct am_state *state, const char **paths,
  * A split_patches_conv() callback that converts a mercurial patch to a RFC2822
  * message suitable for parsing with git-mailinfo.
  */
-static int hg_patch_to_mail(FILE *out, FILE *in, int keep_cr)
+static int hg_patch_to_mail(FILE *out, FILE *in, int keep_cr UNUSED)
 {
 	struct strbuf sb = STRBUF_INIT;
 	int rc = 0;