diff --git a/.github/workflows/Bulk.yml b/.github/workflows/Bulk.yml
index c3cd5365404b7..cec32e01edad7 100644
--- a/.github/workflows/Bulk.yml
+++ b/.github/workflows/Bulk.yml
@@ -68,13 +68,7 @@ jobs:
           set -e
           eval "$(conda shell.bash hook)"
           conda activate bioconda
-          echo '============'
-          conda info --all
-          conda config --show-sources
-          python -c 'import bioconda_utils.utils as u ; import pathlib as p ; print(*(f"{f}:\n{p.Path(f).read_text()}" for f in u.load_conda_build_config().exclusive_config_files), sep="\n")'
-          echo '============'
           bioconda-utils build recipes config.yml \
-            --packages piscem \
-            --docker \
-            --skiplist-leafs
+              --docker --mulled-test \
+              --packages piscem
           conda clean -y --all
diff --git a/recipes/piscem/build.sh b/recipes/piscem/build.sh
index acd3d77c823be..80a4b5965e3a9 100644
--- a/recipes/piscem/build.sh
+++ b/recipes/piscem/build.sh
@@ -24,11 +24,11 @@ if [ "$unamestr" == 'Darwin' ];
 then
 
 # build statically linked binary with Rust
-RUSTFLAGS="-C link-args=-Wl,-undefined,dynamic_lookup" RUST_BACKTRACE=1 cargo install --verbose --root $PREFIX --path .
+RUSTFLAGS="-C link-args=-Wl,-undefined,dynamic_lookup" RUST_BACKTRACE=1 cargo install -j 1 --verbose --root $PREFIX --path .
 
 else
 
 # build statically linked binary with Rust
-RUST_BACKTRACE=1 cargo install --verbose --root $PREFIX --path .
+RUST_BACKTRACE=1 cargo install -j 1 --verbose --root $PREFIX --path .
 
 fi