diff --git a/lighthub/main.cpp b/lighthub/main.cpp
index 61e4daf..f6d2389 100644
--- a/lighthub/main.cpp
+++ b/lighthub/main.cpp
@@ -477,7 +477,7 @@ void onInitialStateInitLAN() {
 #if defined(__AVR__) || defined(__SAM3X8E__)||defined(ARDUINO_ARCH_STM32F1)
 #ifdef W5500_CS_PIN
     Ethernet.w5500_cspin = W5500_CS_PIN;
-    debugSerial<<"Use W5500 pin: ";
+    debugSerial<<F("Use W5500 pin: ");
     debugSerial<<(Ethernet.w5500_cspin);
 #endif
     IPAddress ip, dns, gw, mask;
@@ -553,7 +553,7 @@ void softRebootFunc(){
 
 void resetHard() {
 #ifdef RESET_PIN
-    debugSerial<<"Reset Arduino with digital pin ";
+    debugSerial<<F("Reset Arduino with digital pin ");
     debugSerial<<QUOTE(RESET_PIN);
     delay(500);
     pinMode(RESET_PIN, OUTPUT);
@@ -1182,7 +1182,7 @@ void printFirmwareVersionAndBuildOptions() {
 #endif
 
 #ifdef RESET_PIN
-    debugSerial<<"\n(+)HARDRESET on pin="<<QUOTE(RESET_PIN);
+    debugSerial<<F("\n(+)HARDRESET on pin=")<<QUOTE(RESET_PIN);
 #else
     debugSerial<<F("\n(-)HARDRESET, using soft");
 #endif