diff --git a/src/clusterd/src/lib.rs b/src/clusterd/src/lib.rs
index 9f4a60fe26b3d..c568143f1f39c 100644
--- a/src/clusterd/src/lib.rs
+++ b/src/clusterd/src/lib.rs
@@ -179,7 +179,6 @@ pub fn main() {
     let ncpus_useful = usize::max(1, std::cmp::min(num_cpus::get(), num_cpus::get_physical()));
     let runtime = tokio::runtime::Builder::new_multi_thread()
         .worker_threads(ncpus_useful)
-        .thread_stack_size(3 * 1024 * 1024) // 3 MiB
         // The default thread name exceeds the Linux limit on thread name
         // length, so pick something shorter. The maximum length is 16 including
         // a \0 terminator. This gives us four decimals, which should be enough
diff --git a/src/environmentd/src/environmentd/main.rs b/src/environmentd/src/environmentd/main.rs
index 5404afbba4255..8e16ddf89f904 100644
--- a/src/environmentd/src/environmentd/main.rs
+++ b/src/environmentd/src/environmentd/main.rs
@@ -709,7 +709,6 @@ fn run(mut args: Args) -> Result<(), anyhow::Error> {
     let runtime = Arc::new(
         tokio::runtime::Builder::new_multi_thread()
             .worker_threads(ncpus_useful)
-            .thread_stack_size(3 * 1024 * 1024) // 3 MiB
             // The default thread name exceeds the Linux limit on thread name
             // length, so pick something shorter.
             .thread_name_fn(|| {