diff --git a/Include/frameobject.h b/Include/frameobject.h
index 2458881..d9b375a 100644
--- a/Include/frameobject.h
+++ b/Include/frameobject.h
@@ -58,7 +58,7 @@
 
 /* Standard object interface */
 
-extern typeobject Frametype;
+extern DL_IMPORT typeobject Frametype;
 
 #define is_frameobject(op) ((op)->ob_type == &Frametype)