diff --git a/rvm/src/org/jikesrvm/compilers/opt/regalloc/ia32/CallingConvention.java b/rvm/src/org/jikesrvm/compilers/opt/regalloc/ia32/CallingConvention.java
index 03db6a34a..6a6ccd015 100644
--- a/rvm/src/org/jikesrvm/compilers/opt/regalloc/ia32/CallingConvention.java
+++ b/rvm/src/org/jikesrvm/compilers/opt/regalloc/ia32/CallingConvention.java
@@ -647,7 +647,7 @@ private static void expandPrologue(IR ir) {
             // the symbolic.  First a move from the physical to a fresh temp
             // before start and second a move from the temp to the
             // 'real' parameter symbolic after start.
-            RegisterOperand tmp = ir.regpool.makeTemp(TypeReference.Int);
+            RegisterOperand tmp = ir.regpool.makeTemp(rType);
             Register param = phys.getGPRParam(gprIndex);
             RegisterOperand pOp = new RegisterOperand(param, rType);
             start.insertBefore(PhysicalRegisterTools.makeMoveInstruction(tmp, pOp));