diff --git a/nix/t1/verilated.nix b/nix/t1/verilated.nix
index 942258cc8e..95e8285666 100644
--- a/nix/t1/verilated.nix
+++ b/nix/t1/verilated.nix
@@ -22,11 +22,12 @@ stdenv.mkDerivation {
     echo "[nix] running verilator"
     verilator \
       ${lib.optionalString enable-trace "--trace-fst"} \
+      --cc \
       --timing \
       --threads 8 \
       -O1 \
       -F filelist.f \
-      --cc TestBench
+      --top TestBench
 
     echo "[nix] building verilated C lib"