diff --git a/external/libabacus b/external/libabacus
index 37593ab..8c9acaf 160000
--- a/external/libabacus
+++ b/external/libabacus
@@ -1 +1 @@
-Subproject commit 37593abe40d70733a1749dba5a7d37c8cea120a2
+Subproject commit 8c9acafc932541d9a1c09f1fa0a93ac992254309