diff --git a/litex/soc/cores/cpu/rocket/core.py b/litex/soc/cores/cpu/rocket/core.py
index c0dfba472..94e002233 100644
--- a/litex/soc/cores/cpu/rocket/core.py
+++ b/litex/soc/cores/cpu/rocket/core.py
@@ -119,10 +119,10 @@ class Rocket(CPU):
     # Arch.
     @staticmethod
     def get_arch(variant):
-        arch = "rv64imac"
         if "full" in variant:
-            arch += "fdc"
-        return arch
+            return "rv64imafdc"
+        else:
+            return "rv64imac"
 
     # Memory Mapping.
     @property