diff --git a/tools/llvm2cpp/CppWriter.cpp b/tools/llvm2cpp/CppWriter.cpp
index c2dadad..2533752 100644
--- a/tools/llvm2cpp/CppWriter.cpp
+++ b/tools/llvm2cpp/CppWriter.cpp
@@ -515,7 +515,8 @@
         nl(Out);
       }
       Out << "StructType* " << typeName << " = StructType::get("
-          << typeName << "_fields);";
+          << typeName << "_fields, /*isPacked=*/"
+          << (ST->isPacked() ? "true" : "false") << ");";
       nl(Out);
       break;
     }