diff --git a/lib/Target/CppBackend/CPPBackend.cpp b/lib/Target/CppBackend/CPPBackend.cpp
index 22dd3058de0..8b450304d47 100644
--- a/lib/Target/CppBackend/CPPBackend.cpp
+++ b/lib/Target/CppBackend/CPPBackend.cpp
@@ -1065,6 +1065,10 @@ namespace {
     }
 
     switch (I->getOpcode()) {
+    default:
+      error("Invalid instruction");
+      break;
+
     case Instruction::Ret: {
       const ReturnInst* ret =  cast<ReturnInst>(I);
       Out << "ReturnInst::Create("