diff --git a/src/libutil/args.hh b/src/libutil/args.hh
index 513b8d811..127a0809e 100644
--- a/src/libutil/args.hh
+++ b/src/libutil/args.hh
@@ -2,6 +2,7 @@
 ///@file
 
 #include <functional>
+#include <filesystem>
 #include <map>
 #include <memory>
 #include <optional>