diff --git a/src/backup/dynamic_index.rs b/src/backup/dynamic_index.rs
index 54561205..1619d8db 100644
--- a/src/backup/dynamic_index.rs
+++ b/src/backup/dynamic_index.rs
@@ -194,7 +194,7 @@ impl IndexFile for DynamicIndexReader {
         if pos >= self.index.len() {
             None
         } else {
-            Some(unsafe { std::mem::transmute(self.chunk_digest(pos).as_ptr()) })
+            Some(unsafe { &*(self.chunk_digest(pos).as_ptr() as *const [u8; 32]) })
         }
     }
 
diff --git a/src/backup/fixed_index.rs b/src/backup/fixed_index.rs
index 5eb7f04a..ceb6fe29 100644
--- a/src/backup/fixed_index.rs
+++ b/src/backup/fixed_index.rs
@@ -166,7 +166,7 @@ impl IndexFile for FixedIndexReader {
         if pos >= self.index_length {
             None
         } else {
-            Some(unsafe { std::mem::transmute(self.index.add(pos * 32)) })
+            Some(unsafe { &*(self.index.add(pos * 32) as *const [u8; 32]) })
         }
     }