diff --git a/source/utils/CarlaString.hpp b/source/utils/CarlaString.hpp
index 964a62164..7aef521c9 100644
--- a/source/utils/CarlaString.hpp
+++ b/source/utils/CarlaString.hpp
@@ -819,7 +819,7 @@ public:
         std::memcpy(newBuf, fBuffer, fBufferLen);
         std::memcpy(newBuf + fBufferLen, strBuf, strBufLen + 1);
 
-        return CarlaString(newBuf);
+        return CarlaString(newBuf, false);
     }
 
     CarlaString operator+(const CarlaString& str) noexcept