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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 2d8edebb5..88c339e8c 100644
--- a/passes/hierarchy/hierarchy.cc
+++ b/passes/hierarchy/hierarchy.cc
@@ -910,7 +910,7 @@ struct HierarchyPass : public Pass {
if (m == nullptr)
continue;
- if (m->get_bool_attribute("\\blackbox") && !cell->parameters.empty()) {
+ if (m->get_bool_attribute("\\blackbox") && !cell->parameters.empty() && m->get_bool_attribute("\\dynports")) {
IdString new_m_name = m->derive(design, cell->parameters, true);
if (new_m_name.empty())
continue;