Index: include/llvm/ExecutionEngine/Orc/RPCByteChannel.h
===================================================================
--- include/llvm/ExecutionEngine/Orc/RPCByteChannel.h
+++ include/llvm/ExecutionEngine/Orc/RPCByteChannel.h
@@ -144,14 +144,14 @@
 };
 
 template <typename ChannelT>
-class SerializationTraits<ChannelT, uint8_t>
+class SerializationTraits<ChannelT, unsigned char>
   : public RPCByteChannelPrimitiveSerialization<ChannelT, uint8_t> {
 public:
   static const char* getName() { return "uint8_t"; }
 };
 
 template <typename ChannelT>
-class SerializationTraits<ChannelT, int8_t>
+class SerializationTraits<ChannelT, signed char>
   : public RPCByteChannelPrimitiveSerialization<ChannelT, int8_t> {
 public:
   static const char* getName() { return "int8_t"; }