diff --git a/include/stdexec/__detail/__when_all.hpp b/include/stdexec/__detail/__when_all.hpp
index 0b8867f79..305bf4f57 100644
--- a/include/stdexec/__detail/__when_all.hpp
+++ b/include/stdexec/__detail/__when_all.hpp
@@ -33,6 +33,7 @@ import stdexec;
 #  include "__domain.hpp"
 #  include "__env.hpp"
 #  include "__into_variant.hpp"
+#  include "__just.hpp"
 #  include "__meta.hpp"
 #  include "__optional.hpp"
 #  include "__schedulers.hpp"