diff --git a/WiFiManager.h b/WiFiManager.h
index 05ccd60..829ed6d 100644
--- a/WiFiManager.h
+++ b/WiFiManager.h
@@ -198,13 +198,7 @@ class WiFiManager
     unsigned long _webPortalAccessed      = 0;
     WiFiMode_t    _usermode               = WIFI_OFF;
     
-    #ifdef ESP8266
-        String        _wifissidprefix         = "ESP";
-    #elif defined(ESP32)
-        String        _wifissidprefix         = "ESP32";
-    #else
-        String        _wifissidprefix         = "WM";
-    #endif
+    String    _wifissidprefix             = FPSTR(S_ssidpre);
 
     // option parameters
     int           _minimumQuality         = -1;
diff --git a/strings_en.h b/strings_en.h
index 344c862..ba80113 100644
--- a/strings_en.h
+++ b/strings_en.h
@@ -173,6 +173,14 @@ const char S_ip[]                 PROGMEM = "ip";
 const char S_gw[]                 PROGMEM = "gw";
 const char S_sn[]                 PROGMEM = "sn";
 
+#ifdef ESP8266
+	const char S_ssidpre[]        PROGMEM = "ESP";
+#elif defined(ESP32)
+	const char S_ssidpre[]        PROGMEM = "ESP32";
+#else
+	const char S_ssidpre[]        PROGMEM = "WM";
+#endif
+
 //Tokens
 //@todo consolidate and reduce
 const char T_1[]                  PROGMEM = "{1}"; // @token 1