diff --git a/dtool/src/dtoolbase/deletedBufferChain.h b/dtool/src/dtoolbase/deletedBufferChain.h
index fb1b505e66..43b9cc7fa8 100644
--- a/dtool/src/dtoolbase/deletedBufferChain.h
+++ b/dtool/src/dtoolbase/deletedBufferChain.h
@@ -66,7 +66,7 @@ enum DeletedChainFlag {
 //               Use MemoryHook to get a new DeletedBufferChain of a
 //               particular size.
 ////////////////////////////////////////////////////////////////////
-class DeletedBufferChain {
+class EXPCL_DTOOL DeletedBufferChain {
 protected:
   DeletedBufferChain(size_t buffer_size);