diff --git a/llvm/lib/Target/AArch64/AArch64InstrInfo.td b/llvm/lib/Target/AArch64/AArch64InstrInfo.td
index 8adceb9ffd1536e38d2a7ae55ecd70dff0ba3640..5e83e47d68b4f7598d0b0301b8ef0e83e9a1472f 100644
--- a/llvm/lib/Target/AArch64/AArch64InstrInfo.td
+++ b/llvm/lib/Target/AArch64/AArch64InstrInfo.td
@@ -1609,6 +1609,7 @@ def : Pat<(AArch64mrs imm:$id),
 
 // The thread pointer (on Linux, at least, where this has been implemented) is
 // TPIDR_EL0.
+let hasSideEffects = 1 in
 def MOVbaseTLS : Pseudo<(outs GPR64:$dst), (ins),
                        [(set GPR64:$dst, AArch64threadpointer)]>, Sched<[WriteSys]>;