diff --git a/llvm/lib/Target/AArch64/AArch64FrameLowering.cpp b/llvm/lib/Target/AArch64/AArch64FrameLowering.cpp
--- a/llvm/lib/Target/AArch64/AArch64FrameLowering.cpp
+++ b/llvm/lib/Target/AArch64/AArch64FrameLowering.cpp
@@ -1814,7 +1814,7 @@
       if (NeedsWinCFI) {
         HasWinCFI = true;
         BuildMI(MBB, MBBI, DL, TII->get(AArch64::SEH_StackAlloc))
-            .addImm(NumBytes & andMaskEncoded)
+            .addImm(NumBytes)
             .setMIFlag(MachineInstr::FrameSetup);
       }
     }