diff --git a/llvm/lib/MC/MCDisassembler/EDToken.cpp b/llvm/lib/MC/MCDisassembler/EDToken.cpp
index edbe0e0..5f6c9df 100644
--- a/llvm/lib/MC/MCDisassembler/EDToken.cpp
+++ b/llvm/lib/MC/MCDisassembler/EDToken.cpp
@@ -87,7 +87,7 @@
 
 int EDToken::tokenize(std::vector<EDToken*> &tokens,
                       std::string &str,
-                      const char *operandOrder,
+                      const signed char *operandOrder,
                       EDDisassembler &disassembler) {
   SmallVector<MCParsedAsmOperand*, 5> parsedOperands;
   SmallVector<AsmToken, 10> asmTokens;