diff --git a/eval/public/ast_rewrite_test.cc b/eval/public/ast_rewrite_test.cc
index b2ee8d13c..c7297b5b1 100644
--- a/eval/public/ast_rewrite_test.cc
+++ b/eval/public/ast_rewrite_test.cc
@@ -501,7 +501,7 @@ TEST(AstCrawlerTest, CheckExprRewriteHandlers) {
 // Simple rewrite that replaces a select path with a dot-qualified identifier.
 class RewriterExample : public AstRewriterBase {
  public:
-  RewriterExample() {}
+  RewriterExample() = default;
   bool PostVisitRewrite(Expr* expr, const SourcePosition* info) override {
     if (target_.has_value() && expr->id() == *target_) {
       expr->mutable_ident_expr()->set_name("com.google.Identifier");
@@ -552,7 +552,7 @@ TEST(AstRewrite, SelectRewriteExample) {
 // both passes.
 class PreRewriterExample : public AstRewriterBase {
  public:
-  PreRewriterExample() {}
+  PreRewriterExample() = default;
   bool PreVisitRewrite(Expr* expr, const SourcePosition* info) override {
     if (expr->ident_expr().name() == "x") {
       expr->mutable_ident_expr()->set_name("y");
diff --git a/eval/public/builtin_func_test.cc b/eval/public/builtin_func_test.cc
index a69091de4..6355bd033 100644
--- a/eval/public/builtin_func_test.cc
+++ b/eval/public/builtin_func_test.cc
@@ -55,7 +55,7 @@ using ::testing::Eq;
 
 class BuiltinsTest : public ::testing::Test {
  protected:
-  BuiltinsTest() {}
+  BuiltinsTest() = default;
 
   // Helper method. Looks up in registry and tests comparison operation.
   void PerformRun(absl::string_view operation, absl::optional<CelValue> target,
@@ -1123,7 +1123,7 @@ class FakeList : public CelList {
 
 class FakeErrorMap : public CelMap {
  public:
-  FakeErrorMap() {}
+  FakeErrorMap() = default;
 
   int size() const override { return 0; }
 
diff --git a/eval/public/extension_func_test.cc b/eval/public/extension_func_test.cc
index 2e2497d7d..c9f5fb4fa 100644
--- a/eval/public/extension_func_test.cc
+++ b/eval/public/extension_func_test.cc
@@ -32,7 +32,7 @@ static const int kNanosPerSecond = 1000000000;
 
 class ExtensionTest : public ::testing::Test {
  protected:
-  ExtensionTest() {}
+  ExtensionTest() = default;
 
   void SetUp() override {
     ASSERT_OK(RegisterBuiltinFunctions(&registry_));