diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
index a232d82acd1..ae98da5ef8b 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
@@ -385,6 +385,8 @@ void SelectionDAGISel::SelectBasicBlock(BasicBlock *LLVMBB,
         DILocation DILoc(Dbg);
         DebugLoc Loc = ExtractDebugLocation(DILoc, MF->getDebugLocInfo());
         SDL->setCurDebugLoc(Loc);
+        if (MF->getDefaultDebugLoc().isUnknown())
+          MF->setDefaultDebugLoc(Loc);
       }
     }
     if (!isa<TerminatorInst>(I))