diff --git a/external/libabacus b/external/libabacus
index 899ac31..c4a7117 160000
--- a/external/libabacus
+++ b/external/libabacus
@@ -1 +1 @@
-Subproject commit 899ac31210d31bea3b08bc94fc03432dd8a6029e
+Subproject commit c4a7117704e6548a880b50fbc499e524bfed5823