diff --git a/src/util/AllocatedArray.hxx b/src/util/AllocatedArray.hxx
index 86a703511..0a2240d1b 100644
--- a/src/util/AllocatedArray.hxx
+++ b/src/util/AllocatedArray.hxx
@@ -107,7 +107,7 @@ public:
 		return *this;
 	}
 
-	AllocatedArray &operator=(std::nullptr_t n) noexcept {
+	AllocatedArray &operator=(std::nullptr_t) noexcept {
 		delete[] buffer.data();
 		buffer = {};
 		return *this;