diff --git a/src/tint/ast/traverse_expressions.h b/src/tint/ast/traverse_expressions.h
index f4e4716..bcf0bfd 100644
--- a/src/tint/ast/traverse_expressions.h
+++ b/src/tint/ast/traverse_expressions.h
@@ -68,7 +68,7 @@
         size_t depth;
     };
 
-    utils::Vector<Pending, 64> to_visit{{root, 0}};
+    utils::Vector<Pending, 32> to_visit{{root, 0}};
 
     auto push_single = [&](const ast::Expression* expr, size_t depth) {
         to_visit.Push({expr, depth});
diff --git a/src/tint/resolver/resolver.cc b/src/tint/resolver/resolver.cc
index 4295bab..ab25bfb 100644
--- a/src/tint/resolver/resolver.cc
+++ b/src/tint/resolver/resolver.cc
@@ -1276,7 +1276,7 @@
 }
 
 sem::Expression* Resolver::Expression(const ast::Expression* root) {
-    utils::Vector<const ast::Expression*, 128> sorted;
+    utils::Vector<const ast::Expression*, 64> sorted;
     constexpr size_t kMaxExpressionDepth = 512U;
     bool failed = false;
     if (!ast::TraverseExpressions<ast::TraverseOrder::RightToLeft>(