diff --git a/aeron-client/src/main/cpp/util/CommandOption.h b/aeron-client/src/main/cpp/util/CommandOption.h
index cd6c72cd0a..e3b443e10f 100644
--- a/aeron-client/src/main/cpp/util/CommandOption.h
+++ b/aeron-client/src/main/cpp/util/CommandOption.h
@@ -59,7 +59,7 @@ class CommandOption
         return m_helpText;
     }
 
-    void addParam(std::string p)
+    void addParam(const std::string& p)
     {
         m_params.push_back(p);
     }