diff --git a/llvm/lib/CodeGen/GlobalISel/Combiner.cpp b/llvm/lib/CodeGen/GlobalISel/Combiner.cpp
index 75b2525e368af..c5ec73cd5c65d 100644
--- a/llvm/lib/CodeGen/GlobalISel/Combiner.cpp
+++ b/llvm/lib/CodeGen/GlobalISel/Combiner.cpp
@@ -217,9 +217,8 @@ Combiner::WorkListMaintainer::create(Level Lvl, WorkListTy &WorkList,
   case Level::SinglePass:
     return std::make_unique<WorkListMaintainerImpl<Level::SinglePass>>(WorkList,
                                                                        MRI);
-  default:
-    llvm_unreachable("Illegal ObserverLevel");
   }
+  llvm_unreachable("Illegal ObserverLevel");
 }
 
 Combiner::Combiner(MachineFunction &MF, CombinerInfo &CInfo,