diff --git a/tests/codegen/default.nix b/tests/codegen/default.nix
index 4bf91db83..3c03c9f94 100644
--- a/tests/codegen/default.nix
+++ b/tests/codegen/default.nix
@@ -29,6 +29,7 @@ let
           ${riscv-vector-test}/bin/single \
             -VLEN "${builtins.toString rtlDesignMetadata.vlen}" \
             -XLEN "${builtins.toString rtlDesignMetadata.xlen}" \
+            -float16 false \
             -repeat 16 \
             -testfloat3level 2 \
             -configfile ${riscv-vector-test}/configs/${rawCaseName}.toml \