1 files changed, 1 insertions, 1 deletions
diff --git a/lib/IR/DataLayout.cpp b/lib/IR/DataLayout.cpp
index c117d29b7f69..d5e29649a237 100644
--- a/lib/IR/DataLayout.cpp
+++ b/lib/IR/DataLayout.cpp
@@ -307,7 +307,7 @@ void DataLayout::parseSpecifier(StringRef Desc) {
     case 'a': {
       AlignTypeEnum AlignType;
       switch (Specifier) {
-      default:
+      default: llvm_unreachable("Unexpected specifier!");
       case 'i': AlignType = INTEGER_ALIGN; break;
       case 'v': AlignType = VECTOR_ALIGN; break;
       case 'f': AlignType = FLOAT_ALIGN; break;