diff --git a/fs/ecryptfs/crypto.c b/fs/ecryptfs/crypto.c
index c88e355f7635f61e59f58cb4acc617b84928e4e5..000eae2782b6e905aefa05980ef91c54b81a8274 100644
--- a/fs/ecryptfs/crypto.c
+++ b/fs/ecryptfs/crypto.c
@@ -408,7 +408,7 @@ static loff_t lower_offset_for_page(struct ecryptfs_crypt_stat *crypt_stat,
 				    struct page *page)
 {
 	return ecryptfs_lower_header_size(crypt_stat) +
-	       (page->index << PAGE_CACHE_SHIFT);
+	       ((loff_t)page->index << PAGE_CACHE_SHIFT);
 }
 
 /**