diff --git a/MdePkg/Library/BaseLib/Arm/SetJumpLongJump.asm b/MdePkg/Library/BaseLib/Arm/SetJumpLongJump.asm
index 15eb3dc28f..f89cfa231b 100644
--- a/MdePkg/Library/BaseLib/Arm/SetJumpLongJump.asm
+++ b/MdePkg/Library/BaseLib/Arm/SetJumpLongJump.asm
@@ -33,7 +33,7 @@
 SetJump
   MOV  R3, R13
   STM  R0, {R3-R12,R14}
-  MOV  RO, #0
+  MOV  R0, #0
   BX   LR
 
 ;/**