diff --git a/clang/lib/Serialization/ASTReaderStmt.cpp b/clang/lib/Serialization/ASTReaderStmt.cpp
index ab62f8f178515..21d33e1c57cc9 100644
--- a/clang/lib/Serialization/ASTReaderStmt.cpp
+++ b/clang/lib/Serialization/ASTReaderStmt.cpp
@@ -558,8 +558,6 @@ void ASTStmtReader::VisitConstantExpr(ConstantExpr *E) {
       Record.getContext().addDestruction(&E->APValueResult());
     }
     break;
-  default:
-    llvm_unreachable("unexpected ResultKind!");
   }
 
   E->setSubExpr(Record.readSubExpr());
diff --git a/clang/lib/Serialization/ASTWriterStmt.cpp b/clang/lib/Serialization/ASTWriterStmt.cpp
index 00b1e42617359..edfa3fab6cd45 100644
--- a/clang/lib/Serialization/ASTWriterStmt.cpp
+++ b/clang/lib/Serialization/ASTWriterStmt.cpp
@@ -573,8 +573,6 @@ void ASTStmtWriter::VisitConstantExpr(ConstantExpr *E) {
   case ConstantResultStorageKind::APValue:
     Record.AddAPValue(E->APValueResult());
     break;
-  default:
-    llvm_unreachable("unexpected ResultKind!");
   }
 
   Record.AddStmt(E->getSubExpr());