diff --git a/config/rv64gc/config.vh b/config/rv64gc/config.vh
index fa603990b..5853f87a4 100644
--- a/config/rv64gc/config.vh
+++ b/config/rv64gc/config.vh
@@ -47,7 +47,7 @@ localparam SSTC_SUPPORTED = 1;
 localparam ZICBOM_SUPPORTED = 1;
 localparam ZICBOZ_SUPPORTED = 1;
 localparam ZICBOP_SUPPORTED = 1;
-localparam ZICCLSM_SUPPORTED = 0;
+localparam ZICCLSM_SUPPORTED = 1;
 localparam SVPBMT_SUPPORTED = 1;
 localparam SVNAPOT_SUPPORTED = 1;
 localparam SVINVAL_SUPPORTED = 1;