diff --git a/lib/Target/ARM/ARMInstrInfo.td b/lib/Target/ARM/ARMInstrInfo.td
index 814f506..8f947fe 100644
--- a/lib/Target/ARM/ARMInstrInfo.td
+++ b/lib/Target/ARM/ARMInstrInfo.td
@@ -1579,7 +1579,7 @@
                         Pseudo, NoItinerary,
                         "dmb", "",
                         [(ARMMemBarrier)]>,
-                        Requires<[HasV7]> {
+                        Requires<[IsARM, HasV7]> {
   let Inst{31-4} = 0xf57ff05;
   // FIXME: add support for options other than a full system DMB
   let Inst{3-0} = 0b1111;
@@ -1589,7 +1589,7 @@
                         Pseudo, NoItinerary,
                         "dsb", "",
                         [(ARMSyncBarrier)]>,
-                        Requires<[HasV7]> {
+                        Requires<[IsARM, HasV7]> {
   let Inst{31-4} = 0xf57ff04;
   // FIXME: add support for options other than a full system DSB
   let Inst{3-0} = 0b1111;
diff --git a/lib/Target/ARM/ARMInstrThumb2.td b/lib/Target/ARM/ARMInstrThumb2.td
index 0f2024f..a2aa1c0 100644
--- a/lib/Target/ARM/ARMInstrThumb2.td
+++ b/lib/Target/ARM/ARMInstrThumb2.td
@@ -1073,14 +1073,16 @@
 def t2Int_MemBarrierV7 : AInoP<(outs), (ins),
                         Pseudo, NoItinerary,
                         "dmb", "",
-                        [(ARMMemBarrier)]> {
+                        [(ARMMemBarrier)]>,
+                        Requires<[IsThumb2]> {
   // FIXME: add support for options other than a full system DMB
 }
 
 def t2Int_SyncBarrierV7 : AInoP<(outs), (ins),
                         Pseudo, NoItinerary,
                         "dsb", "",
-                        [(ARMSyncBarrier)]> {
+                        [(ARMSyncBarrier)]>,
+                        Requires<[IsThumb2]> {
   // FIXME: add support for options other than a full system DSB
 }
 }