diff --git a/packages/test-harness/scripts/build-tests.sh b/packages/test-harness/scripts/build-tests.sh
index 462955afc4..b5c99511ea 100755
--- a/packages/test-harness/scripts/build-tests.sh
+++ b/packages/test-harness/scripts/build-tests.sh
@@ -1,6 +1,4 @@
 #!/usr/bin/env bash
 set -euo pipefail
 
-TESTS="$(find .. -name '*.test.ts')"
-
-pnpm run build:base --outdir=dist --out-extension:.js=.cjs $TESTS
+find .. -name '*.test.ts' | xargs -n 50 pnpm run build:base --outdir=dist --out-extension:.js=.cjs