diff --git a/lib/src/backend.rs b/lib/src/backend.rs
index 76779804b34..edc81b31851 100644
--- a/lib/src/backend.rs
+++ b/lib/src/backend.rs
@@ -114,11 +114,11 @@ impl ContentHash for MergedTreeId {
     fn hash(&self, state: &mut impl digest::Update) {
         match self {
             MergedTreeId::Legacy(tree_id) => {
-                state.update(b"0");
+                state.update(&0u32.to_le_bytes());
                 ContentHash::hash(tree_id, state);
             }
             MergedTreeId::Merge(tree_ids) => {
-                state.update(b"1");
+                state.update(&1u32.to_le_bytes());
                 ContentHash::hash(tree_ids, state);
             }
         }
diff --git a/lib/src/content_hash.rs b/lib/src/content_hash.rs
index 8f5d67a3a71..5b25797db0b 100644
--- a/lib/src/content_hash.rs
+++ b/lib/src/content_hash.rs
@@ -76,9 +76,9 @@ impl ContentHash for String {
 impl<T: ContentHash> ContentHash for Option<T> {
     fn hash(&self, state: &mut impl digest::Update) {
         match self {
-            None => state.update(&[0]),
+            None => state.update(&0u32.to_le_bytes()),
             Some(x) => {
-                state.update(&[1]);
+                state.update(&0u32.to_le_bytes());
                 x.hash(state)
             }
         }