diff --git a/object.h b/object.h
index df8abe9..1111f64 100644
--- a/object.h
+++ b/object.h
@@ -148,4 +148,9 @@ void object_array_clear(struct object_array *array);
 
 void clear_object_flags(unsigned flags);
 
+/*
+ * Clear the specified object flags from all in-core commit objects.
+ */
+extern void clear_commit_marks_all(unsigned int flags);
+
 #endif /* OBJECT_H */