diff --git a/tools/llvm-objcopy/CopyConfig.cpp b/tools/llvm-objcopy/CopyConfig.cpp
index c805631..d707bec 100644
--- a/tools/llvm-objcopy/CopyConfig.cpp
+++ b/tools/llvm-objcopy/CopyConfig.cpp
@@ -316,6 +316,7 @@
         ("^" + Pattern.ltrim('^').rtrim('$') + "$").toStringRef(Data)));
   }
   }
+  llvm_unreachable("Unhandled llvm.objcopy.MatchStyle enum");
 }
 
 static Error addSymbolsToRenameFromFile(StringMap<StringRef> &SymbolsToRename,