diff --git a/src/event/Loop.cxx b/src/event/Loop.cxx
index c845a874b..1a548f689 100644
--- a/src/event/Loop.cxx
+++ b/src/event/Loop.cxx
@@ -179,13 +179,13 @@ EventLoop::HandleTimers() noexcept
 }
 
 void
-EventLoop::AddDefer(DeferEvent &d) noexcept
+EventLoop::AddDefer(DeferEvent &e) noexcept
 {
 #ifdef HAVE_THREADED_EVENT_LOOP
 	assert(!IsAlive() || IsInside());
 #endif
 
-	defer.push_back(d);
+	defer.push_back(e);
 	again = true;
 }
 
diff --git a/src/event/Loop.hxx b/src/event/Loop.hxx
index d49a801e0..3ac874bc7 100644
--- a/src/event/Loop.hxx
+++ b/src/event/Loop.hxx
@@ -211,7 +211,7 @@ public:
 	/**
 	 * Schedule a call to DeferEvent::RunDeferred().
 	 */
-	void AddDefer(DeferEvent &d) noexcept;
+	void AddDefer(DeferEvent &e) noexcept;
 	void AddIdle(DeferEvent &e) noexcept;
 
 #ifdef HAVE_THREADED_EVENT_LOOP