diff --git a/backends/aiger/aiger.cc b/backends/aiger/aiger.cc
index 4ef28be9f..97acf937c 100644
--- a/backends/aiger/aiger.cc
+++ b/backends/aiger/aiger.cc
@@ -119,16 +119,16 @@ struct AigerWriter
 			if (wire->name.isPublic())
 				sigmap.add(wire);
 
-		// promote input wires
-		for (auto wire : module->wires())
-			if (wire->port_input)
-				sigmap.add(wire);
-
 		// promote output wires
 		for (auto wire : module->wires())
 			if (wire->port_output)
 				sigmap.add(wire);
 
+		// promote input wires
+		for (auto wire : module->wires())
+			if (wire->port_input)
+				sigmap.add(wire);
+
 		for (auto wire : module->wires())
 		{
 			if (wire->attributes.count(ID::init)) {