diff --git a/kernel/celltypes.h b/kernel/celltypes.h
index 6aebabc19..3167a9add 100644
--- a/kernel/celltypes.h
+++ b/kernel/celltypes.h
@@ -29,6 +29,8 @@ struct CellType
 	RTLIL::IdString type;
 	pool<RTLIL::IdString> inputs, outputs;
 	bool is_evaluable;
+	bool is_combinatorial;
+	bool is_synthesizable;
 };
 
 struct CellTypes
@@ -56,9 +58,9 @@ struct CellTypes
 		setup_stdcells_mem();
 	}
 
-	void setup_type(RTLIL::IdString type, const pool<RTLIL::IdString> &inputs, const pool<RTLIL::IdString> &outputs, bool is_evaluable = false)
+	void setup_type(RTLIL::IdString type, const pool<RTLIL::IdString> &inputs, const pool<RTLIL::IdString> &outputs, bool is_evaluable = false, bool is_combinatorial = false, bool is_synthesizable = false)
 	{
-		CellType ct = {type, inputs, outputs, is_evaluable};
+		CellType ct = {type, inputs, outputs, is_evaluable, is_combinatorial, is_synthesizable};
 		cell_types[ct.type] = ct;
 	}