diff --git a/lib/CodeGen/RegAllocLocal.cpp b/lib/CodeGen/RegAllocLocal.cpp
index 080e6c6..d1a6df0 100644
--- a/lib/CodeGen/RegAllocLocal.cpp
+++ b/lib/CodeGen/RegAllocLocal.cpp
@@ -583,7 +583,7 @@
         if (TM->getInstrInfo().isTwoAddrInstr(MI->getOpcode()) && i == 0) {
           // must be same register number as the first operand
           // This maps a = b + c into b += c, and saves b into a's spot
-          assert(MI->getOperand(1).isRegister()  &&
+          assert(MI->getOperand(1).isPhysicalRegister()  &&
                  MI->getOperand(1).getAllocatedRegNum() &&
                  MI->getOperand(1).opIsUse() &&
                  "Two address instruction invalid!");