diff --git a/msvc/ecl.def b/msvc/ecl.def
index e65942f70..bd2cc37cb 100644
--- a/msvc/ecl.def
+++ b/msvc/ecl.def
@@ -1190,6 +1190,7 @@ EXPORTS
 
 	; defstruct.lsp
 
+	si_assert_slot_type
 	si_define_structure
 
 	; helpfile.lsp
@@ -1344,6 +1345,13 @@ EXPORTS
 	cl_pprint_dispatch
 	cl_set_pprint_dispatch
 
+	; clos\boot.lsp
+
+	cl_slot_boundp
+	cl_slot_exists_p
+	cl_slot_makunbound
+	cl_slot_value
+
 	; clos\defclass.lsp
 
 	clos_ensure_class