diff --git a/src/op.cpp b/src/op.cpp
index f5eec52..68dbe33 100644
--- a/src/op.cpp
+++ b/src/op.cpp
@@ -60,7 +60,7 @@ void Op::Write(Stream& stream) const {
     }
 }
 
-void Op::Add(Operand* operand) {
+void Op::Sink(Operand* operand) {
     Add(static_cast<const Operand*>(operand));
     operand_store.push_back(std::unique_ptr<Operand>(operand));
 }
diff --git a/src/op.h b/src/op.h
index d0ef39a..7111721 100644
--- a/src/op.h
+++ b/src/op.h
@@ -27,7 +27,7 @@ class Op : public Operand {
 
     void Write(Stream& stream) const;
 
-    void Add(Operand* operand);
+    void Sink(Operand* operand);
 
     void Add(const Operand* operand);