diff --git a/techlibs/common/prep.cc b/techlibs/common/prep.cc
index c354956bc..e9176304d 100644
--- a/techlibs/common/prep.cc
+++ b/techlibs/common/prep.cc
@@ -189,6 +189,7 @@ struct PrepPass : public ScriptPass
 				run(ifxmode ? "proc -ifx" : "proc");
 			if (help_mode || flatten)
 				run("flatten", "(if -flatten)");
+			run("future");
 			run(nokeepdc ? "opt_expr" : "opt_expr -keepdc");
 			run("opt_clean");
 			run("check");