diff --git a/Firmware/ultralcd.cpp b/Firmware/ultralcd.cpp
index 7c7bf24e6..adf5ff4bf 100644
--- a/Firmware/ultralcd.cpp
+++ b/Firmware/ultralcd.cpp
@@ -455,12 +455,12 @@ uint8_t lcdui_print_extruder(void) {
     lcd_space(1);
     if (MMU2::mmu2.get_current_tool() == MMU2::mmu2.get_tool_change_tool()) {
         lcd_putc('F');
-        lcd_putc(MMU2::mmu2.get_current_tool() == (uint8_t)MMU2::FILAMENT_UNKNOWN ? '?' : MMU2::mmu2.get_current_tool() + 1);
+        lcd_putc(MMU2::mmu2.get_current_tool() == (uint8_t)MMU2::FILAMENT_UNKNOWN ? '?' : MMU2::mmu2.get_current_tool() + '1');
         chars += 2;
     } else {
-        lcd_putc(MMU2::mmu2.get_current_tool() == (uint8_t)MMU2::FILAMENT_UNKNOWN ? '?' : MMU2::mmu2.get_current_tool() + 1);
+        lcd_putc(MMU2::mmu2.get_current_tool() == (uint8_t)MMU2::FILAMENT_UNKNOWN ? '?' : MMU2::mmu2.get_current_tool() + '1');
         lcd_putc('>');
-        lcd_putc(MMU2::mmu2.get_tool_change_tool() == (uint8_t)MMU2::FILAMENT_UNKNOWN ? '?' : MMU2::mmu2.get_tool_change_tool() + 1);
+        lcd_putc(MMU2::mmu2.get_tool_change_tool() == (uint8_t)MMU2::FILAMENT_UNKNOWN ? '?' : MMU2::mmu2.get_tool_change_tool() + '1');
         chars += 3;
     }
     return chars;