diff --git a/llvm/lib/ExecutionEngine/JITLink/x86_64.cpp b/llvm/lib/ExecutionEngine/JITLink/x86_64.cpp
--- a/llvm/lib/ExecutionEngine/JITLink/x86_64.cpp
+++ b/llvm/lib/ExecutionEngine/JITLink/x86_64.cpp
@@ -57,7 +57,7 @@
                                     0x00, 0x00, 0x00, 0x00};
 
 const char PointerJumpStubContent[6] = {
-    static_cast<char>(0xFF), 0x25, 0x00, 0x00, 0x00, 0x00};
+    static_cast<char>(0xFFu), 0x25, 0x00, 0x00, 0x00, 0x00};
 
 } // end namespace x86_64
 } // end namespace jitlink