diff --git a/src/prolog/parser b/src/prolog/parser
index 61f1b22d..ad4f9e57 160000
--- a/src/prolog/parser
+++ b/src/prolog/parser
@@ -1 +1 @@
-Subproject commit 61f1b22ddd58b1d4b261fc0a35a2eba4404912b6
+Subproject commit ad4f9e573069ab5932c060d0ed093432f3d31c58