diff --git a/ESPFirewall/lib/Firewall/src/Storage.hpp b/ESPFirewall/lib/Firewall/src/Storage.hpp
index 79599ac..85e1532 100644
--- a/ESPFirewall/lib/Firewall/src/Storage.hpp
+++ b/ESPFirewall/lib/Firewall/src/Storage.hpp
@@ -18,7 +18,10 @@ namespace fw
 #ifdef ESP32
         Preferences memory;
 #elif defined(ESP8266)
-        const uint16_t eeprom_size = 1000;
+        // Storage per firewall rule is 34 Byte
+        // Space for 15 Rules is 510 Byte
+        // plus 10 byte for settings
+        const uint16_t eeprom_size = 520;
         const uint8_t security_number = 93;
         const uint16_t eeprom_settings_head = 0;
         const uint16_t eeprom_amout_of_rules_head = eeprom_settings_head + 1;