diff --git a/fastfield_codecs/src/linearinterpol.rs b/fastfield_codecs/src/linearinterpol.rs
index 8d1a9f374..8905c8008 100644
--- a/fastfield_codecs/src/linearinterpol.rs
+++ b/fastfield_codecs/src/linearinterpol.rs
@@ -124,7 +124,7 @@ fn diff(val1: u64, val2: u64) -> f64 {
 }
 
 #[inline]
-fn get_calculated_value(first_val: u64, pos: u64, slope: f32) -> u64 {
+pub fn get_calculated_value(first_val: u64, pos: u64, slope: f32) -> u64 {
     if slope < 0.0 {
         first_val - (pos as f32 * -slope) as u64
     } else {
diff --git a/fastfield_codecs/src/multilinearinterpol.rs b/fastfield_codecs/src/multilinearinterpol.rs
index 198d4765b..1c1f57352 100644
--- a/fastfield_codecs/src/multilinearinterpol.rs
+++ b/fastfield_codecs/src/multilinearinterpol.rs
@@ -17,7 +17,7 @@ use common::{BinarySerializable, CountingWriter, DeserializeFrom};
 use ownedbytes::OwnedBytes;
 use tantivy_bitpacker::{compute_num_bits, BitPacker, BitUnpacker};
 
-use crate::linearinterpol::get_slope;
+use crate::linearinterpol::{get_calculated_value, get_slope};
 use crate::{FastFieldCodecReader, FastFieldCodecSerializer, FastFieldDataAccess, FastFieldStats};
 
 const CHUNK_SIZE: u64 = 512;
@@ -355,11 +355,6 @@ fn distance<T: Sub<Output = T> + Ord>(x: T, y: T) -> T {
     }
 }
 
-#[inline]
-fn get_calculated_value(first_val: u64, pos: u64, slope: f32) -> u64 {
-    (first_val as i64 + (pos as f32 * slope) as i64) as u64
-}
-
 #[cfg(test)]
 mod tests {
     use super::*;