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-rw-r--r--passes/hierarchy/hierarchy.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/passes/hierarchy/hierarchy.cc b/passes/hierarchy/hierarchy.cc
index a1361c68..67b57a94 100644
--- a/passes/hierarchy/hierarchy.cc
+++ b/passes/hierarchy/hierarchy.cc
@@ -117,7 +117,7 @@ static void generate(RTLIL::Design *design, const std::vector<std::string> &cell
RTLIL::Module *mod = new RTLIL::Module;
mod->name = celltype;
mod->attributes["\\blackbox"] = RTLIL::Const(1);
- design->modules_[mod->name] = mod;
+ design->add(mod);
for (auto &decl : ports) {
RTLIL::Wire *wire = mod->addWire(decl.portname, portwidths.at(decl.portname));