diff --git a/src/jansson.def b/src/jansson.def
index da4cfd4..98c4570 100644
--- a/src/jansson.def
+++ b/src/jansson.def
@@ -66,4 +66,5 @@ EXPORTS
     json_unpack_ex
     json_vunpack_ex
     json_set_alloc_funcs
+    json_set_alloc_funcs_arg