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1diff --git a/src/google/protobuf/metadata_lite.h b/src/google/protobuf/metadata_lite.h
2index d6cf87f47107a..7963ef8772d26 100644
3--- a/src/google/protobuf/metadata_lite.h
4+++ b/src/google/protobuf/metadata_lite.h
5@@ -60,7 +60,7 @@ namespace internal {
6 // It uses bit 0 == 0 to indicate an arena pointer and bit 0 == 1 to indicate a
7 // UFS+Arena-container pointer. Besides it uses bit 1 == 0 to indicate arena
8 // allocation and bit 1 == 1 to indicate heap allocation.
9-class InternalMetadata {
10+class PROTOBUF_EXPORT InternalMetadata {
11  public:
12   constexpr InternalMetadata() : ptr_(0) {}
13   explicit InternalMetadata(Arena* arena, bool is_message_owned = false)
14