diff --git a/lib/MC/MCAsmStreamer.cpp b/lib/MC/MCAsmStreamer.cpp
index 41f88334e2b..273b17d3c2c 100644
--- a/lib/MC/MCAsmStreamer.cpp
+++ b/lib/MC/MCAsmStreamer.cpp
@@ -210,7 +210,7 @@ void MCAsmStreamer::EmitZerofill(MCSection *Section, MCSymbol *Symbol,
 void MCAsmStreamer::EmitBytes(const StringRef &Data) {
   assert(CurSection && "Cannot emit contents before setting section!");
   for (unsigned i = 0, e = Data.size(); i != e; ++i)
-    OS << ".byte " << (unsigned) Data[i] << '\n';
+    OS << ".byte " << (unsigned) (unsigned char) Data[i] << '\n';
 }
 
 void MCAsmStreamer::EmitValue(const MCValue &Value, unsigned Size) {
diff --git a/test/MC/AsmParser/directive_ascii.s b/test/MC/AsmParser/directive_ascii.s
index 68328f51c8b..cc6d23b751d 100644
--- a/test/MC/AsmParser/directive_ascii.s
+++ b/test/MC/AsmParser/directive_ascii.s
@@ -31,9 +31,10 @@ TEST3:
 # CHECK: .byte 1
 # CHECK: .byte 0
 # CHECK: .byte 49
+# CHECK: .byte 128
 # CHECK: .byte 0
 TEST4:  
-        .ascii "\1\01\07\08\001\0001\b\0"
+        .ascii "\1\01\07\08\001\0001\200\0"
         
 # CHECK: TEST5:
 # CHECK: .byte 8