diff --git a/lib/Target/ARM/ARMInstrInfo.td b/lib/Target/ARM/ARMInstrInfo.td
index de5a9fe5b0d..a70d6dfe815 100644
--- a/lib/Target/ARM/ARMInstrInfo.td
+++ b/lib/Target/ARM/ARMInstrInfo.td
@@ -1358,9 +1358,7 @@ def LDM_UPD : AXI4ld<(outs GPR:$wb), (ins addrmode4:$addr, pred:$p,
                                       reglist:$dsts, variable_ops),
                      IndexModeUpd, LdStMulFrm, IIC_iLoadm,
                      "ldm${addr:submode}${p}\t$addr!, $dsts",
-                     "$addr.addr = $wb", []> {
-  let Inst{21} = 1; // wback
-}
+                     "$addr.addr = $wb", []>;
 } // mayLoad, hasExtraDefRegAllocReq
 
 let mayStore = 1, hasExtraSrcRegAllocReq = 1 in {
@@ -1373,9 +1371,7 @@ def STM_UPD : AXI4st<(outs GPR:$wb), (ins addrmode4:$addr, pred:$p,
                                       reglist:$srcs, variable_ops),
                      IndexModeUpd, LdStMulFrm, IIC_iStorem,
                      "stm${addr:submode}${p}\t$addr!, $srcs",
-                     "$addr.addr = $wb", []> {
-  let Inst{21} = 1; // wback
-}
+                     "$addr.addr = $wb", []>;
 } // mayStore, hasExtraSrcRegAllocReq
 
 //===----------------------------------------------------------------------===//