diff --git a/layout/base/nsRefreshDriver.cpp b/layout/base/nsRefreshDriver.cpp
index 7fa544a77d656..6676bea9778b1 100644
--- a/layout/base/nsRefreshDriver.cpp
+++ b/layout/base/nsRefreshDriver.cpp
@@ -517,7 +517,7 @@ class VsyncRefreshDriverTimer : public RefreshDriverTimer
       }
     }
   private:
-    ~RefreshDriverVsyncObserver() {}
+    ~RefreshDriverVsyncObserver() = default;
 
     void RecordTelemetryProbes(TimeStamp aVsyncTimestamp)
     {
@@ -866,7 +866,7 @@ class VsyncChildCreateCallback final : public nsIIPCBackgroundChildCreateCallbac
   }
 
 private:
-  virtual ~VsyncChildCreateCallback() {}
+  virtual ~VsyncChildCreateCallback() = default;
 
   void ActorCreated(PBackgroundChild* aPBackgroundChild) override
   {
diff --git a/layout/style/nsCSSRuleProcessor.cpp b/layout/style/nsCSSRuleProcessor.cpp
index 677deb92d7458..07a4ef57b32d3 100644
--- a/layout/style/nsCSSRuleProcessor.cpp
+++ b/layout/style/nsCSSRuleProcessor.cpp
@@ -770,9 +770,7 @@ struct SelectorPair
     MOZ_ASSERT(aSelector);
     MOZ_ASSERT(mRightmostSelector);
   }
-  SelectorPair(const SelectorPair& aOther)
-    : mSelector(aOther.mSelector)
-    , mRightmostSelector(aOther.mRightmostSelector) {}
+  SelectorPair(const SelectorPair& aOther) = default;
   nsCSSSelector* const mSelector;
   nsCSSSelector* const mRightmostSelector;
 };