diff --git a/lib/CodeGen/RegAllocLinearScan.cpp b/lib/CodeGen/RegAllocLinearScan.cpp
index 69c3120..26c1417 100644
--- a/lib/CodeGen/RegAllocLinearScan.cpp
+++ b/lib/CodeGen/RegAllocLinearScan.cpp
@@ -443,7 +443,7 @@
                     unsigned virtReg = op.getAllocatedRegNum();
                     Virt2PhysMap::const_iterator it = v2pMap_.find(virtReg);
                     if (it != v2pMap_.end()) {
-                        DEBUG(std::cerr << "\t\t\t%reg" << it->second
+                        DEBUG(std::cerr << "\t\t\t%reg" << it->first
                               << " -> " << mri_->getName(it->second) << '\n');
                         (*currentInstr_)->SetMachineOperandReg(i, it->second);
                     }