diff --git a/CHANGES b/CHANGES
index d8cff9d39..2263a5448 100644
--- a/CHANGES
+++ b/CHANGES
@@ -7,6 +7,7 @@ Version 0.15
 ------------
 
 (feature release, released on X)
+- Fix issue with hash index files larger than 2GB.
 - Fix Python 3.2 compatibility issue with noatime open() (#164)
 - Include missing pyx files in dist files (#168)
 
diff --git a/attic/_hashindex.c b/attic/_hashindex.c
index b0cd11bff..c0c541287 100644
--- a/attic/_hashindex.c
+++ b/attic/_hashindex.c
@@ -162,7 +162,7 @@ hashindex_read(const char *path)
         EPRINTF_PATH(path, "Unknown file header");
         goto fail;
     }
-    if(length != sizeof(HashHeader) + _le32toh(header.num_buckets) * (header.key_size + header.value_size)) {
+    if(length != sizeof(HashHeader) + (off_t)_le32toh(header.num_buckets) * (header.key_size + header.value_size)) {
         EPRINTF_PATH(path, "Incorrect file length");
         goto fail;
     }