1 files changed, 1 insertions, 1 deletions
diff --git a/mojo/system/core_impl.h b/mojo/system/core_impl.h
index 1417a06..aede29d 100644
--- a/mojo/system/core_impl.h
+++ b/mojo/system/core_impl.h
@@ -25,7 +25,7 @@ class CoreTestBase;
 // the (obvious) exception of |Init()|, which must be called first (and the call
 // completed) before making any other calls, all the public methods are
 // thread-safe.
-class CoreImpl {
+class MOJO_SYSTEM_EXPORT CoreImpl {
  public:
   static void Init();