diff --git a/lib/hash.c b/lib/hash.c
index e89171b..04549ad 100644
--- a/lib/hash.c
+++ b/lib/hash.c
@@ -140,7 +140,7 @@
 hash_iterate (struct hash *hash, 
 	      void (*func) (struct hash_backet *, void *), void *arg)
 {
-  int i;
+  unsigned int i;
   struct hash_backet *hb;
   struct hash_backet *hbnext;
 
@@ -159,7 +159,7 @@
 void
 hash_clean (struct hash *hash, void (*free_func) (void *))
 {
-  int i;
+  unsigned int i;
   struct hash_backet *hb;
   struct hash_backet *next;