diff --git a/src/cpu/o3/alpha/cpu_impl.hh b/src/cpu/o3/alpha/cpu_impl.hh
index 618716fc6..15b50cb15 100644
--- a/src/cpu/o3/alpha/cpu_impl.hh
+++ b/src/cpu/o3/alpha/cpu_impl.hh
@@ -231,7 +231,7 @@ Fault
 AlphaO3CPU<Impl>::hwrei(unsigned tid)
 {
     // Need to clear the lock flag upon returning from an interrupt.
-    this->setMiscReg(TheISA::Lock_Flag_DepTag, false, tid);
+    this->setMiscReg(AlphaISA::MISCREG_LOCKFLAG, false, tid);
 
     this->thread[tid]->kernelStats->hwrei();