diff --git a/lib/hash.h b/lib/hash.h
index e0b826304..03c771a47 100644
--- a/lib/hash.h
+++ b/lib/hash.h
@@ -45,7 +45,7 @@ typedef struct _curl_hash_element {
 } curl_hash_element;
 
 
-void Curl_hash_init(curl_hash *, int, curl_hash_dtor);
+int Curl_hash_init(curl_hash *, int, curl_hash_dtor);
 curl_hash *Curl_hash_alloc(int, curl_hash_dtor);
 int Curl_hash_add(curl_hash *, char *, size_t, const void *);
 int Curl_hash_delete(curl_hash *h, char *key, size_t key_len);