diff --git a/src/fastfield/bytes/reader.rs b/src/fastfield/bytes/reader.rs
index 3b217b926..7b674cf7d 100644
--- a/src/fastfield/bytes/reader.rs
+++ b/src/fastfield/bytes/reader.rs
@@ -52,7 +52,7 @@ impl BytesFastFieldReader {
     }
 
     /// Returns the overall number of bytes in this bytes fast field.
-    pub fn total_num_bytes(&self) -> u64 {
-        self.values.len() as u64
+    pub fn total_num_bytes(&self) -> u32 {
+        self.values.len() as u32
     }
 }
diff --git a/src/fastfield/multivalued/index.rs b/src/fastfield/multivalued/index.rs
index 6f77da34a..fca5d7027 100644
--- a/src/fastfield/multivalued/index.rs
+++ b/src/fastfield/multivalued/index.rs
@@ -34,8 +34,8 @@ impl MultiValueIndex {
 
     /// Returns the overall number of values in this field.
     #[inline]
-    pub fn total_num_vals(&self) -> u64 {
-        self.idx.max_value()
+    pub fn total_num_vals(&self) -> u32 {
+        self.idx.max_value() as u32
     }
 
     /// Returns the number of documents in the index.
diff --git a/src/fastfield/multivalued/reader.rs b/src/fastfield/multivalued/reader.rs
index 059b42323..3be5bc713 100644
--- a/src/fastfield/multivalued/reader.rs
+++ b/src/fastfield/multivalued/reader.rs
@@ -78,7 +78,7 @@ impl<Item: FastValue> MultiValuedFastFieldReader<Item> {
 
     /// Returns the overall number of values in this field.
     #[inline]
-    pub fn total_num_vals(&self) -> u64 {
+    pub fn total_num_vals(&self) -> u32 {
         self.idx_reader.total_num_vals()
     }
 }
@@ -182,9 +182,9 @@ impl<T: MonotonicallyMappableToU128> MultiValuedU128FastFieldReader<T> {
 
     /// Returns the overall number of values in this field.
     #[inline]
-    pub fn total_num_vals(&self) -> u64 {
+    pub fn total_num_vals(&self) -> u32 {
         assert_eq!(
-            self.vals_reader.num_vals() as u64,
+            self.vals_reader.num_vals(),
             self.get_index_reader().total_num_vals()
         );
         self.idx_reader.total_num_vals()
diff --git a/src/indexer/sorted_doc_id_multivalue_column.rs b/src/indexer/sorted_doc_id_multivalue_column.rs
index 6fb245570..0d035fe2e 100644
--- a/src/indexer/sorted_doc_id_multivalue_column.rs
+++ b/src/indexer/sorted_doc_id_multivalue_column.rs
@@ -117,7 +117,7 @@ impl<'a> RemappedDocIdMultiValueIndexColumn<'a> {
             let segment_reader = segment_and_ff_reader.0;
             let multi_value_length_reader = segment_and_ff_reader.1;
             if !segment_reader.has_deletes() {
-                max_value += multi_value_length_reader.total_num_vals();
+                max_value += multi_value_length_reader.total_num_vals() as u64;
             } else {
                 for doc in segment_reader.doc_ids_alive() {
                     max_value += multi_value_length_reader.num_vals_for_doc(doc) as u64;