1 files changed, 2 insertions, 2 deletions
diff --git a/hash.h b/hash.h
index a8b0fbb..69e33a4 100644
--- a/hash.h
+++ b/hash.h
@@ -28,9 +28,9 @@ struct hash_table {
 	struct hash_table_entry *array;
 };
 
-extern void *lookup_hash(unsigned int hash, struct hash_table *table);
+extern void *lookup_hash(unsigned int hash, const struct hash_table *table);
 extern void **insert_hash(unsigned int hash, void *ptr, struct hash_table *table);
-extern int for_each_hash(struct hash_table *table, int (*fn)(void *));
+extern int for_each_hash(const struct hash_table *table, int (*fn)(void *));
 extern void free_hash(struct hash_table *table);
 
 static inline void init_hash(struct hash_table *table)