diff --git a/esp8266_deauther/DisplayUI.cpp b/esp8266_deauther/DisplayUI.cpp
index 336da04..9b699df 100644
--- a/esp8266_deauther/DisplayUI.cpp
+++ b/esp8266_deauther/DisplayUI.cpp
@@ -8,6 +8,11 @@ void DisplayUI::setupDisplay() {
   // ===== adjustable ===== //
   // initialize display
   display.init();
+  /*
+  In case of a compiler (conversion char/uint8_t) error,
+  make sure to have version 4 of the display library installed
+  https://github.com/ThingPulse/esp8266-oled-ssd1306/releases/tag/4.0.0
+  */
   display.setFont(DejaVu_Sans_Mono_12);
   display.setContrast(255);
   display.flipScreenVertically();
diff --git a/esp8266_deauther/DisplayUI.h b/esp8266_deauther/DisplayUI.h
index 372c0d0..6f12cd5 100644
--- a/esp8266_deauther/DisplayUI.h
+++ b/esp8266_deauther/DisplayUI.h
@@ -156,7 +156,7 @@ class DisplayUI {
 // ===== FONT ===== //
 // Created by http://oleddisplay.squix.ch/ Consider a donation
 // In case of problems make sure that you are using the font file with the correct version!
-const char DejaVu_Sans_Mono_12[] PROGMEM = {
+const uint8_t DejaVu_Sans_Mono_12[] PROGMEM = {
   0x07, // Width: 7
   0x0F, // Height: 15
   0x20, // First Char: 32