diff --git a/msvc/ecl-threads.def b/msvc/ecl-threads.def
index 2dc6e4dc2..a32fd3305 100755
--- a/msvc/ecl-threads.def
+++ b/msvc/ecl-threads.def
@@ -276,6 +276,7 @@ EXPORTS
 	ecl_allocate_foreign_data
 	ecl_foreign_data_pointer_safe
 	ecl_string_pointer_safe
+	ecl_null_terminated_string
 	ecl_foreign_data_ref_elt
 	ecl_foreign_data_set_elt
 
diff --git a/msvc/ecl.def b/msvc/ecl.def
index 18326541d..f93faad6a 100644
--- a/msvc/ecl.def
+++ b/msvc/ecl.def
@@ -276,6 +276,7 @@ EXPORTS
 	ecl_allocate_foreign_data
 	ecl_foreign_data_pointer_safe
 	ecl_string_pointer_safe
+	ecl_null_terminated_string
 	ecl_foreign_data_ref_elt
 	ecl_foreign_data_set_elt