diff --git a/testbench/testbench.sv b/testbench/testbench.sv
index e65fed554..a0417808e 100644
--- a/testbench/testbench.sv
+++ b/testbench/testbench.sv
@@ -715,7 +715,7 @@ end
     
     void'(rvviRefConfigSetString(IDV_CONFIG_MODEL_VENDOR,            "riscv.ovpworld.org"));
     void'(rvviRefConfigSetString(IDV_CONFIG_MODEL_NAME,              "riscv"));
-    void'(rvviRefConfigSetString(IDV_CONFIG_MODEL_VARIANT,           "RV64GC"));
+    void'(rvviRefConfigSetString(IDV_CONFIG_MODEL_VARIANT,           "RV64GCK"));
     void'(rvviRefConfigSetInt(IDV_CONFIG_MODEL_ADDRESS_BUS_WIDTH,     56));
     void'(rvviRefConfigSetInt(IDV_CONFIG_MAX_NET_LATENCY_RETIREMENTS, 6));