diff --git i/src/libYARP_companion/src/yarp/companion/impl/Companion.cmdSplit.cpp w/src/libYARP_companion/src/yarp/companion/impl/Companion.cmdSplit.cpp
index a9024cb03..f4860ac62 100644
--- i/src/libYARP_companion/src/yarp/companion/impl/Companion.cmdSplit.cpp
+++ w/src/libYARP_companion/src/yarp/companion/impl/Companion.cmdSplit.cpp
@@ -111,7 +111,7 @@ int Companion::cmdSplit(int argc, char *argv[])
             inData->mutex.unlock();
             if (siz != 0)
             {
-                yCInfo(COMPANION, std::string("Received a Bottle of "+std::to_string(siz)+" elements.").c_str());
+                yCInfo(COMPANION, "Received a Bottle of %z elements.", siz);
                 outPort = new BufferedPort<Bottle> [siz];
                 for (size_t i = 0; i < siz; i++)
                 {