diff --git a/backends/aiger2/aiger.cc b/backends/aiger2/aiger.cc
index 5521a8133..c6386b783 100644
--- a/backends/aiger2/aiger.cc
+++ b/backends/aiger2/aiger.cc
@@ -87,7 +87,7 @@ struct Index {
 		int pos = index_wires(info, m);
 
 		for (auto cell : m->cells()) {
-			if (cell->type.in(KNOWN_OPS))
+			if (cell->type.in(KNOWN_OPS) || cell->type.in(ID($scopeinfo), ID($specify2), ID($specify3)))
 				continue;
 
 			Module *submodule = m->design->module(cell->type);