diff --git a/include/llvm/Support/InstVisitor.h b/include/llvm/Support/InstVisitor.h
index e4937e10e6b..66992396b14 100644
--- a/include/llvm/Support/InstVisitor.h
+++ b/include/llvm/Support/InstVisitor.h
@@ -101,6 +101,7 @@ struct InstVisitor {
 #include "llvm/Instruction.def"
 
     default: assert(0 && "Unknown instruction type encountered!");
+             abort();
     }
   }