diff --git a/litex/soc/cores/cpu/serv/core.py b/litex/soc/cores/cpu/serv/core.py
index 6fe912be9..c286e6a06 100644
--- a/litex/soc/cores/cpu/serv/core.py
+++ b/litex/soc/cores/cpu/serv/core.py
@@ -17,6 +17,7 @@ CPU_VARIANTS = ["standard"]
 class SERV(CPU):
     name                 = "serv"
     human_name           = "SERV"
+    variants             = CPU_VARIANTS
     data_width           = 32
     endianness           = "little"
     gcc_triple           = CPU_GCC_TRIPLE_RISCV32