diff --git a/lib/Target/ARM/ARMInstrThumb.td b/lib/Target/ARM/ARMInstrThumb.td
index f1edab71c2c..da36a6f9061 100644
--- a/lib/Target/ARM/ARMInstrThumb.td
+++ b/lib/Target/ARM/ARMInstrThumb.td
@@ -92,7 +92,7 @@ def t_addrmode_rr : Operand<i32>,
 //
 def t_addrmode_s4 : Operand<i32>,
                     ComplexPattern<i32, 3, "SelectThumbAddrModeS4", []> {
-  string EncoderMethod = "getAddrModeS4OpValue";
+  let EncoderMethod = "getAddrModeS4OpValue";
   let PrintMethod = "printThumbAddrModeS4Operand";
   let MIOperandInfo = (ops tGPR:$base, i32imm:$offsimm, tGPR:$offsreg);
   let ParserMatchClass = MemModeThumbAsmOperand;
@@ -103,7 +103,7 @@ def t_addrmode_s4 : Operand<i32>,
 //
 def t_addrmode_s2 : Operand<i32>,
                     ComplexPattern<i32, 3, "SelectThumbAddrModeS2", []> {
-  string EncoderMethod = "getAddrModeS2OpValue";
+  let EncoderMethod = "getAddrModeS2OpValue";
   let PrintMethod = "printThumbAddrModeS2Operand";
   let MIOperandInfo = (ops tGPR:$base, i32imm:$offsimm, tGPR:$offsreg);
   let ParserMatchClass = MemModeThumbAsmOperand;
@@ -114,7 +114,7 @@ def t_addrmode_s2 : Operand<i32>,
 //
 def t_addrmode_s1 : Operand<i32>,
                     ComplexPattern<i32, 3, "SelectThumbAddrModeS1", []> {
-  string EncoderMethod = "getAddrModeS1OpValue";
+  let EncoderMethod = "getAddrModeS1OpValue";
   let PrintMethod = "printThumbAddrModeS1Operand";
   let MIOperandInfo = (ops tGPR:$base, i32imm:$offsimm, tGPR:$offsreg);
   let ParserMatchClass = MemModeThumbAsmOperand;