diff --git a/src/dict.c b/src/dict.c
index a1475772..26707dd5 100644
--- a/src/dict.c
+++ b/src/dict.c
@@ -211,6 +211,9 @@ int dictExpand(dict *d, unsigned long size)
     if (dictIsRehashing(d) || d->ht[0].used > size)
         return DICT_ERR;
 
+    /* Rehashing to the same table size is not useful. */
+    if (realsize == d->ht[0].size) return DICT_ERR;
+
     /* Allocate the new hash table and initialize all pointers to NULL */
     n.size = realsize;
     n.sizemask = realsize-1;