diff --git a/src/util/AllocatedString.hxx b/src/util/AllocatedString.hxx
index 72d060756..ae3d73e58 100644
--- a/src/util/AllocatedString.hxx
+++ b/src/util/AllocatedString.hxx
@@ -7,6 +7,7 @@
 
 #include <algorithm>
 #include <cstddef>
+#include <initializer_list>
 #include <string_view>
 #include <utility>