diff --git a/lib/CodeGen/LiveIntervalAnalysis.cpp b/lib/CodeGen/LiveIntervalAnalysis.cpp
index aef5b5f..3c4ada9 100644
--- a/lib/CodeGen/LiveIntervalAnalysis.cpp
+++ b/lib/CodeGen/LiveIntervalAnalysis.cpp
@@ -847,7 +847,7 @@
     assert(LII != NewLI.end() && "Missing live range for PHI");
     if (LII->end != VNI->def.getNextSlot())
       continue;
-    if (!VNI->isPHIDef()) {
+    if (VNI->isPHIDef()) {
       // This is a dead PHI. Remove it.
       VNI->setIsUnused(true);
       NewLI.removeRange(*LII);