diff --git a/MdePkg/Library/BaseLib/AArch64/SwitchStack.S b/MdePkg/Library/BaseLib/AArch64/SwitchStack.S
index 2bce9c998f..c3ac8d7e4d 100644
--- a/MdePkg/Library/BaseLib/AArch64/SwitchStack.S
+++ b/MdePkg/Library/BaseLib/AArch64/SwitchStack.S
@@ -40,6 +40,7 @@ InternalSwitchStackAsm (
   );
 **/
 ASM_PFX(InternalSwitchStackAsm):
+    mov   x29, #0
     mov   x30, x0
     mov   sp, x3
     mov   x0, x1