diff --git a/lib/Target/IA64/IA64ISelPattern.cpp b/lib/Target/IA64/IA64ISelPattern.cpp
index 1ca4176c3a5..cb815212c19 100644
--- a/lib/Target/IA64/IA64ISelPattern.cpp
+++ b/lib/Target/IA64/IA64ISelPattern.cpp
@@ -202,7 +202,9 @@ IA64TargetLowering::LowerArguments(Function &F, SelectionDAG &DAG) {
             argPreg[count] = args_FP[used_FPArgs++];
             argOpc[count] = IA64::FMOV;
             argt = newroot = DAG.getCopyFromReg(DAG.getRoot(), argVreg[count],
-                                                getValueType(I->getType()));
+                                                MVT::f64);
+            if (I->getType() == Type::FloatTy)
+              argt = DAG.getNode(ISD::FP_ROUND, MVT::f32, argt);
             break;
           case MVT::i1: // NOTE: as far as C abi stuff goes,
                         // bools are just boring old ints