--- a/js/public/StructuredClone.h

+++ b/js/public/StructuredClone.h

@@ -328,7 +328,7 @@

 namespace js {

 class SharedArrayRawBuffer;

-class SharedArrayRawBufferRefs {

+class JS_PUBLIC_API SharedArrayRawBufferRefs {

  public:

   SharedArrayRawBufferRefs() = default;

   SharedArrayRawBufferRefs(SharedArrayRawBufferRefs&& other) = default;