diff --git a/lib/CodeGen/CGClass.cpp b/lib/CodeGen/CGClass.cpp
index 59d5ef7..a831ebd 100644
--- a/lib/CodeGen/CGClass.cpp
+++ b/lib/CodeGen/CGClass.cpp
@@ -573,7 +573,8 @@
     llvm::Value *ArrayIndexVar = 0;
     const ConstantArrayType *Array
       = CGF.getContext().getAsConstantArrayType(FieldType);
-    if (Array && Constructor->isCopyOrMoveConstructor()) {
+    if (Array && Constructor->isImplicitlyDefined() &&
+        Constructor->isCopyOrMoveConstructor()) {
       llvm::Type *SizeTy
         = CGF.ConvertType(CGF.getContext().getSizeType());