diff --git a/compute_tools/src/bin/fast_import.rs b/compute_tools/src/bin/fast_import.rs
index 0403ebdd54..c012826fad 100644
--- a/compute_tools/src/bin/fast_import.rs
+++ b/compute_tools/src/bin/fast_import.rs
@@ -202,7 +202,7 @@ pub(crate) async fn main() -> anyhow::Result<()> {
         .args(["-c", &format!("max_parallel_workers={nproc}")])
         .args(["-c", &format!("max_parallel_workers_per_gather={nproc}")])
         .args(["-c", &format!("max_worker_processes={nproc}")])
-        .args(["-c", "effective_io_concurrency=100"])
+        .args(["-c", &format!("effective_io_concurrency={}", if cfg!(target_os = "macos") { 0 } else { 100 })])
         .env_clear()
         .stdout(std::process::Stdio::piped())
         .stderr(std::process::Stdio::piped())