diff --git a/llvm/lib/Target/AVR/MCTargetDesc/AVRMCCodeEmitter.cpp b/llvm/lib/Target/AVR/MCTargetDesc/AVRMCCodeEmitter.cpp
--- a/llvm/lib/Target/AVR/MCTargetDesc/AVRMCCodeEmitter.cpp
+++ b/llvm/lib/Target/AVR/MCTargetDesc/AVRMCCodeEmitter.cpp
@@ -26,6 +26,7 @@
 #include "llvm/MC/MCSubtargetInfo.h"
 #include "llvm/Support/Casting.h"
 #include "llvm/Support/raw_ostream.h"
+#include "llvm/Support/EndianStream.h"
 
 #define DEBUG_TYPE "mccodeemitter"
 
@@ -273,9 +274,7 @@
 
   for (int64_t i = WordCount - 1; i >= 0; --i) {
     uint16_t Word = Words[i];
-
-    OS << (uint8_t) ((Word & 0x00ff) >> 0);
-    OS << (uint8_t) ((Word & 0xff00) >> 8);
+    support::endian::write(OS, Word, support::endianness::native);
   }
 }