diff --git a/src/util/IntrusiveList.hxx b/src/util/IntrusiveList.hxx
index d5f267010..131695b44 100644
--- a/src/util/IntrusiveList.hxx
+++ b/src/util/IntrusiveList.hxx
@@ -396,17 +396,17 @@ public:
 			return Cast(cursor);
 		}
 
-		iterator &operator++() noexcept {
+		auto &operator++() noexcept {
 			cursor = cursor->next;
 			return *this;
 		}
 
-		iterator &operator--() noexcept {
+		auto &operator--() noexcept {
 			cursor = cursor->prev;
 			return *this;
 		}
 
-		iterator &operator--(int) noexcept {
+		auto operator--(int) noexcept {
 			auto old = *this;
 			cursor = cursor->prev;
 			return old;
@@ -461,17 +461,17 @@ public:
 			return Cast(cursor);
 		}
 
-		const_iterator &operator++() noexcept {
+		auto &operator++() noexcept {
 			cursor = cursor->next;
 			return *this;
 		}
 
-		iterator &operator--() noexcept {
+		auto &operator--() noexcept {
 			cursor = cursor->prev;
 			return *this;
 		}
 
-		iterator &operator--(int) noexcept {
+		auto operator--(int) noexcept {
 			auto old = *this;
 			cursor = cursor->prev;
 			return old;