diff --git a/src/netman.h b/src/netman.h
index a859671..7fa01fb 100644
--- a/src/netman.h
+++ b/src/netman.h
@@ -55,7 +55,8 @@ void netman::init(String ssid, String pass, bool hidden) {
     
     // Get the last 4 characters of the MAC address
     String macAddress = WiFi.macAddress();
-    String macSuffix = macAddress.substring(macAddress.length() - 5).replace(":", "");
+    String macSuffix = macAddress.substring(macAddress.length() - 5); 
+    macSuffix.replace(":", "");
 
     // Set default SSID if none provided
     _ssid = ssid.isEmpty() ? "SmartCube_" + macSuffix : ssid;