diff --git a/src/tint/resolver/resolver_test_helper.h b/src/tint/resolver/resolver_test_helper.h
index 1afa838ef5..ac1b9e7121 100644
--- a/src/tint/resolver/resolver_test_helper.h
+++ b/src/tint/resolver/resolver_test_helper.h
@@ -97,11 +97,11 @@ class TestHelper : public ProgramBuilder {
     /// @return true if all users are as expected
     bool CheckVarUsers(const ast::Variable* var,
                        utils::VectorRef<const ast::Expression*> expected_users) {
-        auto& var_users = Sem().Get(var)->Users();
-        if (var_users.size() != expected_users.Length()) {
+        auto var_users = Sem().Get(var)->Users();
+        if (var_users.Length() != expected_users.Length()) {
             return false;
         }
-        for (size_t i = 0; i < var_users.size(); i++) {
+        for (size_t i = 0; i < var_users.Length(); i++) {
             if (var_users[i]->Declaration() != expected_users[i]) {
                 return false;
             }
diff --git a/src/tint/sem/variable.h b/src/tint/sem/variable.h
index 647a77b13c..7e70ca3d78 100644
--- a/src/tint/sem/variable.h
+++ b/src/tint/sem/variable.h
@@ -91,10 +91,10 @@ class Variable : public Castable<Variable, Node> {
     void SetInitializer(const ValueExpression* initializer) { initializer_ = initializer; }
 
     /// @returns the expressions that use the variable
-    const std::vector<const VariableUser*>& Users() const { return users_; }
+    utils::VectorRef<const VariableUser*> Users() const { return users_; }
 
     /// @param user the user to add
-    void AddUser(const VariableUser* user) { users_.emplace_back(user); }
+    void AddUser(const VariableUser* user) { users_.Push(user); }
 
   private:
     const ast::Variable* const declaration_;
@@ -104,7 +104,7 @@ class Variable : public Castable<Variable, Node> {
     const builtin::Access access_;
     const constant::Value* constant_value_;
     const ValueExpression* initializer_ = nullptr;
-    std::vector<const VariableUser*> users_;
+    utils::Vector<const VariableUser*, 8> users_;
 };
 
 /// LocalVariable is a function-scope variable