diff --git a/panda/src/express/weakReferenceList.h b/panda/src/express/weakReferenceList.h
index d6637e1946..036c276b17 100644
--- a/panda/src/express/weakReferenceList.h
+++ b/panda/src/express/weakReferenceList.h
@@ -34,7 +34,7 @@ class WeakPointerToVoid;
 //               ReferenceCount object in the world with the size of
 //               this object.
 ////////////////////////////////////////////////////////////////////
-class WeakReferenceList {
+class EXPCL_PANDAEXPRESS WeakReferenceList {
 public:
   WeakReferenceList();
   ~WeakReferenceList();