diff --git a/llvm/lib/Target/Sparc/AsmParser/SparcAsmParser.cpp b/llvm/lib/Target/Sparc/AsmParser/SparcAsmParser.cpp
index 83b0bf9476ddc..77e9b1d966121 100644
--- a/llvm/lib/Target/Sparc/AsmParser/SparcAsmParser.cpp
+++ b/llvm/lib/Target/Sparc/AsmParser/SparcAsmParser.cpp
@@ -908,6 +908,7 @@ SparcAsmParser::parseTailRelocSym(OperandVector &Operands) {
         return false;
       }
     }
+    llvm_unreachable("Unhandled SparcAsmParser::TailRelocKind enum");
   };
 
   if (getLexer().getKind() != AsmToken::Percent) {