diff --git a/bundle.c b/bundle.c
index d50cfb5aa7..5fa41a52f1 100644
--- a/bundle.c
+++ b/bundle.c
@@ -66,8 +66,8 @@ static int parse_bundle_signature(struct bundle_header *header, const char *line
 	return -1;
 }
 
-static int parse_bundle_header(int fd, struct bundle_header *header,
-			       const char *report_path)
+int read_bundle_header_fd(int fd, struct bundle_header *header,
+			  const char *report_path)
 {
 	struct strbuf buf = STRBUF_INIT;
 	int status = 0;
@@ -143,7 +143,7 @@ int read_bundle_header(const char *path, struct bundle_header *header)
 
 	if (fd < 0)
 		return error(_("could not open '%s'"), path);
-	return parse_bundle_header(fd, header, path);
+	return read_bundle_header_fd(fd, header, path);
 }
 
 int is_bundle(const char *path, int quiet)
@@ -153,7 +153,7 @@ int is_bundle(const char *path, int quiet)
 
 	if (fd < 0)
 		return 0;
-	fd = parse_bundle_header(fd, &header, quiet ? NULL : path);
+	fd = read_bundle_header_fd(fd, &header, quiet ? NULL : path);
 	if (fd >= 0)
 		close(fd);
 	bundle_header_release(&header);
diff --git a/bundle.h b/bundle.h
index 7fef2108f4..0c052f5496 100644
--- a/bundle.h
+++ b/bundle.h
@@ -24,6 +24,8 @@ void bundle_header_release(struct bundle_header *header);
 
 int is_bundle(const char *path, int quiet);
 int read_bundle_header(const char *path, struct bundle_header *header);
+int read_bundle_header_fd(int fd, struct bundle_header *header,
+			  const char *report_path);
 int create_bundle(struct repository *r, const char *path,
 		  int argc, const char **argv, struct strvec *pack_options,
 		  int version);