1 files changed, 4 insertions, 0 deletions
diff --git a/kernel/yosys.h b/kernel/yosys.h
index 88f060a52..d1e01b19c 100644
--- a/kernel/yosys.h
+++ b/kernel/yosys.h
@@ -137,6 +137,8 @@ YOSYS_NAMESPACE_BEGIN
 
 using std::vector;
 using std::string;
+using std::pair;
+
 using hashlib::mkhash;
 using hashlib::mkhash_init;
 using hashlib::mkhash_add;
@@ -221,6 +223,8 @@ YOSYS_NAMESPACE_END
 
 YOSYS_NAMESPACE_BEGIN
 
+using RTLIL::State;
+
 namespace hashlib {
 	template<> struct hash_ops<RTLIL::State> : hash_ops<int> {};
 }