diff --git a/src/util/AllocatedString.hxx b/src/util/AllocatedString.hxx
index 3e449e15b..dd095ede6 100644
--- a/src/util/AllocatedString.hxx
+++ b/src/util/AllocatedString.hxx
@@ -148,7 +148,7 @@ private:
 
 	static constexpr std::size_t TotalSize(std::initializer_list<string_view> src) noexcept {
 		std::size_t size = 0;
-		for (std::string_view i : src)
+		for (const string_view i : src)
 			size += i.size();
 		return size;
 	}