diff --git a/lib/Target/Alpha/AlphaISelPattern.cpp b/lib/Target/Alpha/AlphaISelPattern.cpp
index 912bb69d1e9..49e9b54e3d8 100644
--- a/lib/Target/Alpha/AlphaISelPattern.cpp
+++ b/lib/Target/Alpha/AlphaISelPattern.cpp
@@ -959,7 +959,7 @@ unsigned ISel::SelectExpr(SDOperand N) {
       case MVT::i1:
         Tmp2 = MakeReg(MVT::i64);
         BuildMI(BB, Alpha::ANDi, 2, Tmp2).addReg(Tmp1).addImm(1);
-        BuildMI(BB, Alpha::SUB, 2, Result).addReg(Alpha::F31).addReg(Tmp2);
+        BuildMI(BB, Alpha::SUBQ, 2, Result).addReg(Alpha::F31).addReg(Tmp2);
         break;
       }
       return Result;