diff --git a/src/libcmd/common-eval-args.hh b/src/libcmd/common-eval-args.hh
index 7548bd3b7..25ce5b9da 100644
--- a/src/libcmd/common-eval-args.hh
+++ b/src/libcmd/common-eval-args.hh
@@ -6,6 +6,8 @@
 #include "common-args.hh"
 #include "search-path.hh"
 
+#include <filesystem>
+
 namespace nix {
 
 class Store;