diff --git a/util/read.cpp b/util/read.cpp
index 0365922..b4f355c 100644
--- a/util/read.cpp
+++ b/util/read.cpp
@@ -11,7 +11,7 @@ class NullEventHandler : public YAML::EventHandler {
   using Mark = YAML::Mark;
   using anchor_t = YAML::anchor_t;
 
-  NullEventHandler() {}
+  NullEventHandler() = default;
 
   void OnDocumentStart(const Mark&) override {}
   void OnDocumentEnd() override {}
diff --git a/util/sandbox.cpp b/util/sandbox.cpp
index 4f085db..f21490e 100644
--- a/util/sandbox.cpp
+++ b/util/sandbox.cpp
@@ -9,7 +9,7 @@ class NullEventHandler : public YAML::EventHandler {
   using Mark = YAML::Mark;
   using anchor_t = YAML::anchor_t;
 
-  NullEventHandler() {}
+  NullEventHandler() = default;
 
   void OnDocumentStart(const Mark&) override {}
   void OnDocumentEnd() override {}