diff --git a/ci_scripts/run-rust-test.sh b/ci_scripts/run-rust-test.sh
index ea6ce1543..3cbc06139 100755
--- a/ci_scripts/run-rust-test.sh
+++ b/ci_scripts/run-rust-test.sh
@@ -5,7 +5,7 @@ set -ex
 export RUST_TEST_THREADS=1
 export RUST_BACKTRACE=1
 export RUSTFLAGS='--deny warnings'
-export OPT="-j3 --target=$TARGET"
+export OPT="-j2 --target=$TARGET"
 export OPT_RELASE="--release ${OPT}"
 export OPT_FFI_RELEASE="--manifest-path=deltachat-ffi/Cargo.toml --release"