diff --git a/src/WiFiConfig.cpp b/src/WiFiConfig.cpp
index d2c78c4..f3c8342 100644
--- a/src/WiFiConfig.cpp
+++ b/src/WiFiConfig.cpp
@@ -471,6 +471,10 @@ void WiFiConfig::_handleSetAP(AsyncWebServerRequest *request)
     if (str.length() > 0) {
         uint8_t mode;
 
+        if (USEDFS.exists(F(WIFICFG_OLD_FILE))) {
+            USEDFS.remove(F(WIFICFG_OLD_FILE));
+        }
+        USEDFS.rename(F(WIFICFG_FILE), F(WIFICFG_OLD_FILE));
         strEncode(str);
         svSetV(F("ssid"), str, F(WIFICFG_FILE));
         str = request->arg(F("_p"));
diff --git a/src/WiFiConfig.h b/src/WiFiConfig.h
index 2c623b6..76fa89f 100644
--- a/src/WiFiConfig.h
+++ b/src/WiFiConfig.h
@@ -44,6 +44,9 @@
 #if not defined(WIFICFG_FILE)
 # define WIFICFG_FILE "/wifi.json"
 #endif
+#if not defined(WIFICFG_OLD_FILE)
+# define WIFICFG_OLD_FILE "/wifi.old"
+#endif
 
 // Parametr, predany uzivatelske callback funkci, urceny pro aplikacni vizualizaci stavu konfigurace a pripojeni
 typedef enum {