diff --git a/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp b/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
index b722838b3f0d..fa41ab9b193c 100644
--- a/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
+++ b/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
@@ -746,6 +746,7 @@ public:
       case IK_NoInduction:
         return nullptr;
       }
+      llvm_unreachable("invalid enum");
     }
 
     /// Start value.