diff --git a/toolchains/riscv-tools/riscv-isa-sim b/toolchains/riscv-tools/riscv-isa-sim
index 7812eabb..643e6c6c 160000
--- a/toolchains/riscv-tools/riscv-isa-sim
+++ b/toolchains/riscv-tools/riscv-isa-sim
@@ -1 +1 @@
-Subproject commit 7812eabb441eaf2067d07636a382eca622e48814
+Subproject commit 643e6c6cb0b17c49dcfa80b5b2057dfe076f931d