diff --git a/src/cpu/reg_class.hh b/src/cpu/reg_class.hh
index 9c4af45c66..fa8e2a1702 100644
--- a/src/cpu/reg_class.hh
+++ b/src/cpu/reg_class.hh
@@ -192,7 +192,6 @@ class RegId
             return Scale * regIdx + elemIdx;
         }
         panic("Trying to flatten a register without class!");
-        return -1;
     }
     /** @} */