diff --git a/cpp/devices/ctapdriver.cpp b/cpp/devices/ctapdriver.cpp
index 11fb7db013..8cddc1c87b 100644
--- a/cpp/devices/ctapdriver.cpp
+++ b/cpp/devices/ctapdriver.cpp
@@ -217,7 +217,7 @@ pair<string, string> CTapDriver::ExtractAddressAndMask(const string& s) const
 {
 	string address = s;
 	string netmask = "255.255.255.0"; //NOSONAR This hardcoded IP address is safe
-	if (const auto& components = Split(inet, '/', 2); components.size() == 2) {
+	if (const auto& components = Split(s, '/', 2); components.size() == 2) {
 		address = components[0];
 
 		int m;