1 files changed, 1 insertions, 1 deletions
diff --git a/base/memory/weak_ptr.h b/base/memory/weak_ptr.h
index 1675889..f6001e2 100644
--- a/base/memory/weak_ptr.h
+++ b/base/memory/weak_ptr.h
@@ -83,7 +83,7 @@ class BASE_EXPORT WeakReference {
  public:
   // Although Flag is bound to a specific thread, it may be deleted from another
   // via base::WeakPtr::~WeakPtr().
-  class Flag : public RefCountedThreadSafe<Flag> {
+  class BASE_EXPORT Flag : public RefCountedThreadSafe<Flag> {
    public:
     Flag();