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-rw-r--r--kernel/rtlil.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/rtlil.cc b/kernel/rtlil.cc
index 196e301b6..3e5896813 100644
--- a/kernel/rtlil.cc
+++ b/kernel/rtlil.cc
@@ -776,6 +776,7 @@ void RTLIL::Module::makeblackbox()
connections_.clear();
remove(delwires);
+
set_bool_attribute(ID::blackbox);
}