diff --git a/protocol/osc/method.h b/protocol/osc/method.h
index 242ab8d..8ff7aae 100644
--- a/protocol/osc/method.h
+++ b/protocol/osc/method.h
@@ -55,7 +55,7 @@ public:
 
 protected:
     void trigger(std::shared_ptr<Message>) const;
-    bool matchName(std::string &pattern) const;
+    bool matchName(const std::string &pattern) const;
     bool isRoot() const;
 
 private: