diff --git a/builtin/fast-export.c b/builtin/fast-export.c
index 18fdfb31af..d1d68e9fc6 100644
--- a/builtin/fast-export.c
+++ b/builtin/fast-export.c
@@ -623,7 +623,7 @@ static void import_marks(char *input_file)
 
 		mark = strtoumax(line + 1, &mark_end, 10);
 		if (!mark || mark_end == line + 1
-			|| *mark_end != ' ' || get_sha1(mark_end + 1, sha1))
+			|| *mark_end != ' ' || get_sha1_hex(mark_end + 1, sha1))
 			die("corrupt mark line: %s", line);
 
 		if (last_idnum < mark)
diff --git a/fast-import.c b/fast-import.c
index 5f539d7d8f..3f3214935f 100644
--- a/fast-import.c
+++ b/fast-import.c
@@ -1822,7 +1822,7 @@ static void read_marks(void)
 		*end = 0;
 		mark = strtoumax(line + 1, &end, 10);
 		if (!mark || end == line + 1
-			|| *end != ' ' || get_sha1(end + 1, sha1))
+			|| *end != ' ' || get_sha1_hex(end + 1, sha1))
 			die("corrupt mark line: %s", line);
 		e = find_object(sha1);
 		if (!e) {