diff --git a/llvm/lib/MC/MCParser/COFFMasmParser.cpp b/llvm/lib/MC/MCParser/COFFMasmParser.cpp
index b89eea498d680..9109333cb4677 100644
--- a/llvm/lib/MC/MCParser/COFFMasmParser.cpp
+++ b/llvm/lib/MC/MCParser/COFFMasmParser.cpp
@@ -330,7 +330,7 @@ bool COFFMasmParser::ParseDirectiveSegment(StringRef Directive, SMLoc Loc) {
                 .CaseLower("nocache", COFF::IMAGE_SCN_MEM_NOT_CACHED)
                 .CaseLower("discard", COFF::IMAGE_SCN_MEM_DISCARDABLE)
                 .Default(-1);
-        if (Characteristic == -1) {
+        if (Characteristic == static_cast<unsigned>(-1)) {
           return Error(KeywordLoc,
                        "Expected characteristic in SEGMENT directive; found '" +
                            Keyword + "'");