diff --git a/lib/Basic/Targets.cpp b/lib/Basic/Targets.cpp
index 8aa4a4f..ee5875a 100644
--- a/lib/Basic/Targets.cpp
+++ b/lib/Basic/Targets.cpp
@@ -621,7 +621,9 @@
 namespace {
 class DarwinPPCTargetInfo : public DarwinTargetInfo {
 public:
-  DarwinPPCTargetInfo(const std::string& triple) : DarwinTargetInfo(triple) {}
+  DarwinPPCTargetInfo(const std::string& triple) : DarwinTargetInfo(triple) {
+    CharIsSigned = false;
+  }
   
   virtual void getTargetDefines(std::vector<char> &Defines) const {
     DarwinTargetInfo::getTargetDefines(Defines);
@@ -659,6 +661,7 @@
 class DarwinPPC64TargetInfo : public DarwinTargetInfo {
 public:
   DarwinPPC64TargetInfo(const std::string& triple) : DarwinTargetInfo(triple) {
+    CharIsSigned = false;
     LongWidth = LongAlign = PointerWidth = PointerAlign = 64;
   }