diff --git a/src/cpu/o3/cpu.cc b/src/cpu/o3/cpu.cc
index e5b8103aba..8f399e9f53 100644
--- a/src/cpu/o3/cpu.cc
+++ b/src/cpu/o3/cpu.cc
@@ -1466,7 +1466,7 @@ FullO3CPU<Impl>::setArchVecElem(const RegIndex& reg_idx, const ElemIndex& ldx,
                                 const VecElem& val, ThreadID tid)
 {
     PhysRegIdPtr phys_reg = commitRenameMap[tid].lookup(
-                RegId(VecRegClass, reg_idx, ldx));
+                RegId(VecElemClass, reg_idx, ldx));
     setVecElem(phys_reg, val);
 }