diff --git a/src/tree/mod.rs b/src/tree/mod.rs
index da18aab7..9ce6f4aa 100644
--- a/src/tree/mod.rs
+++ b/src/tree/mod.rs
@@ -438,6 +438,10 @@ impl TryFrom<&Context> for WalkParallel {
             .overrides(ctx.no_git_override()?)
             .threads(ctx.threads);
 
+        if ctx.suppress_size && ctx.level() == 1 {
+            builder.max_depth(Some(1)).threads(1);
+        }
+
         if ctx.pattern.is_some() {
             if ctx.glob || ctx.iglob {
                 builder.filter_entry(ctx.glob_predicate()?);