diff --git a/src/webserver.cpp b/src/webserver.cpp
index e71c3648..6b1ffc28 100644
--- a/src/webserver.cpp
+++ b/src/webserver.cpp
@@ -325,7 +325,7 @@ bool webserver::start(bool blocking)
 
     if(this->daemon == NULL)
     {
-        throw std::invalid_argument("Unable to connect daemon to port: " + this->port);
+        throw std::invalid_argument("Unable to connect daemon to port: " + std::to_string(this->port));
     }
 
     bool value_onclose = false;