diff --git a/lib/CodeGen/MachineModuleInfoImpls.cpp b/lib/CodeGen/MachineModuleInfoImpls.cpp
index 10de1de..7a62929 100644
--- a/lib/CodeGen/MachineModuleInfoImpls.cpp
+++ b/lib/CodeGen/MachineModuleInfoImpls.cpp
@@ -38,7 +38,8 @@
 MachineModuleInfoMachO::GetSortedStubs(const DenseMap<const MCSymbol*, 
                                                       const MCSymbol*> &Map) {
   MachineModuleInfoMachO::SymbolListTy List(Map.begin(), Map.end());
-  qsort(&List[0], List.size(), sizeof(List[0]), SortSymbolPair);
+  if (!List.empty())
+    qsort(&List[0], List.size(), sizeof(List[0]), SortSymbolPair);
   return List;
 }