1 files changed, 6 insertions, 0 deletions
diff --git a/kernel/yosys.h b/kernel/yosys.h
index 700a0603d..c0004abce 100644
--- a/kernel/yosys.h
+++ b/kernel/yosys.h
@@ -159,6 +159,10 @@ namespace RTLIL {
 	struct Monitor;
 }
 
+namespace AST {
+	struct AstNode;
+}
+
 using RTLIL::IdString;
 using RTLIL::Const;
 using RTLIL::SigBit;
@@ -174,12 +178,14 @@ namespace hashlib {
 	template<> struct hash_ops<RTLIL::Module*> : hash_obj_ops {};
 	template<> struct hash_ops<RTLIL::Design*> : hash_obj_ops {};
 	template<> struct hash_ops<RTLIL::Monitor*> : hash_obj_ops {};
+	template<> struct hash_ops<AST::AstNode*> : hash_obj_ops {};
 
 	template<> struct hash_ops<const RTLIL::Wire*> : hash_obj_ops {};
 	template<> struct hash_ops<const RTLIL::Cell*> : hash_obj_ops {};
 	template<> struct hash_ops<const RTLIL::Module*> : hash_obj_ops {};
 	template<> struct hash_ops<const RTLIL::Design*> : hash_obj_ops {};
 	template<> struct hash_ops<const RTLIL::Monitor*> : hash_obj_ops {};
+	template<> struct hash_ops<const AST::AstNode*> : hash_obj_ops {};
 }
 
 void memhasher_on();