diff --git a/Marlin/LiquidCrystalRus.cpp b/Marlin/LiquidCrystalRus.cpp
index 66bb370857..9f3f5c055b 100644
--- a/Marlin/LiquidCrystalRus.cpp
+++ b/Marlin/LiquidCrystalRus.cpp
@@ -1,3 +1,4 @@
+#define __PROG_TYPES_COMPAT__
 #include "LiquidCrystalRus.h"
 
 #include <stdio.h>
@@ -13,7 +14,7 @@
 
 // it is a russian alphabet translation
 // except 0401 --> 0xa2 = ╗, 0451 --> 0xb5
-PROGMEM prog_uchar utf_recode[] = 
+const PROGMEM prog_uchar utf_recode[] = 
        { 0x41,0xa0,0x42,0xa1,0xe0,0x45,0xa3,0xa4,0xa5,0xa6,0x4b,0xa7,0x4d,0x48,0x4f,
          0xa8,0x50,0x43,0x54,0xa9,0xaa,0x58,0xe1,0xab,0xac,0xe2,0xad,0xae,0x62,0xaf,0xb0,0xb1,
          0x61,0xb2,0xb3,0xb4,0xe3,0x65,0xb6,0xb7,0xb8,0xb9,0xba,0xbb,0xbc,0xbd,0x6f,