diff --git a/crates/milli/src/vector/mod.rs b/crates/milli/src/vector/mod.rs
index 5955de277..6ff7dc608 100644
--- a/crates/milli/src/vector/mod.rs
+++ b/crates/milli/src/vector/mod.rs
@@ -147,7 +147,7 @@ impl HannoyWrapper {
             if self.quantized {
                 let writer = hannoy::Writer::new(self.quantized_db(), index, dimension);
                 if writer.need_build(wtxn)? {
-                    writer.builder(rng).ef_construction(64).build::<16, 32>(wtxn)?
+                    writer.builder(rng).ef_construction(48).build::<16, 32>(wtxn)?
                 } else if writer.is_empty(wtxn)? {
                     continue;
                 }
@@ -173,7 +173,7 @@ impl HannoyWrapper {
                         .available_memory(hannoy_memory.unwrap_or(usize::MAX))
                         // .progress(|step| progress.update_progress_from_hannoy(step))
                         // .cancel(cancel)
-                        .ef_construction(64)
+                        .ef_construction(48)
                         .build::<16, 32>(wtxn)?;
                 } else if writer.is_empty(wtxn)? {
                     continue;