diff --git a/hash/risc0/bench/README.md b/hash/risc0/bench/README.md
index 936cb1a..d0bf8ae 100644
--- a/hash/risc0/bench/README.md
+++ b/hash/risc0/bench/README.md
@@ -3,7 +3,7 @@ Benchmarking different hashes inside risc'0 zkvm
 
 The benchmark is defined by the following shell scripts:
 
-- `build.sh` - build the code. you can set the number of threads by setting the environment variable `CARGO_BUILD_JOBS` otherwise the code will build using default number of threads.
+- `build.sh` - build the code.
 
 - `run.sh` and `run2.sh` - run the benchmark itself (`run.sh` for sha256, keccak, blake2b, blake3 and `run2.sh` for poseidon2 over bn128 and babybear)
 
diff --git a/hash/risc0/bench/build.sh b/hash/risc0/bench/build.sh
index d1cf927..0dfa161 100755
--- a/hash/risc0/bench/build.sh
+++ b/hash/risc0/bench/build.sh
@@ -1,7 +1,3 @@
 #!/bin/bash
 
-if [ -z ${ZKBENCH_NTHREADS} ]; then 
-ZKBENCH_NTHREADS="default"    # https://doc.rust-lang.org/cargo/reference/config.html#buildjobs
-fi
-
-CARGO_BUILD_JOBS=$ZKBENCH_NTHREADS cargo build --release
+ cargo build --release