diff --git a/lighthouse-core/test/test-utils.js b/lighthouse-core/test/test-utils.js
index 4fac8c6134be..d4c7f94f0e57 100644
--- a/lighthouse-core/test/test-utils.js
+++ b/lighthouse-core/test/test-utils.js
@@ -57,7 +57,7 @@ function getProtoRoundTrip() {
   let itIfProtoExists;
   try {
     sampleResultsRoundtripStr =
-      fs.readFileSync(__dirname + '/../../dist/proto/sample_v2_round_trip.json', 'utf-8');
+      fs.readFileSync(__dirname + '/../../.tmp/sample_v2_round_trip.json', 'utf-8');
     describeIfProtoExists = describe;
     itIfProtoExists = it;
   } catch (err) {
diff --git a/package.json b/package.json
index cbb7f5993ce5..9a68dc4da9a1 100644
--- a/package.json
+++ b/package.json
@@ -71,7 +71,7 @@
     "ultradumbBenchmark": "./lighthouse-core/scripts/benchmark.js",
     "minify-latest-run": "./lighthouse-core/scripts/lantern/minify-trace.js ./latest-run/defaultPass.trace.json ./latest-run/defaultPass.trace.min.json && ./lighthouse-core/scripts/lantern/minify-devtoolslog.js ./latest-run/defaultPass.devtoolslog.json ./latest-run/defaultPass.devtoolslog.min.json",
     "compile-proto": "protoc --python_out=./ ./proto/lighthouse-result.proto && mv ./proto/*_pb2.py ./proto/scripts || (echo \"❌ Install protobuf ≥ 3.7.1 to compile the proto file.\" && false)",
-    "build-proto-roundtrip": "mkdir -p dist/proto && cd proto/scripts && PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION=cpp PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION_VERSION=2 python json_roundtrip_via_proto.py",
+    "build-proto-roundtrip": "mkdir -p ./tmp && cd proto/scripts && PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION=cpp PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION_VERSION=2 python json_roundtrip_via_proto.py",
     "static-server": "node lighthouse-cli/test/fixtures/static-server.js"
   },
   "devDependencies": {
diff --git a/proto/scripts/json_roundtrip_via_proto.py b/proto/scripts/json_roundtrip_via_proto.py
index dab60ba6b39e..4527be08aec3 100644
--- a/proto/scripts/json_roundtrip_via_proto.py
+++ b/proto/scripts/json_roundtrip_via_proto.py
@@ -10,7 +10,7 @@
 
 path_sample_preprocessed = path_dir + '/sample_v2_processed.json'
 path_sample = path_dir + '/../../lighthouse-core/test/results/sample_v2.json'
-path_round_trip = path_dir + '/../../dist/proto/sample_v2_round_trip.json'
+path_round_trip = path_dir + '/../../.tmp/sample_v2_round_trip.json'
 
 def clean():
     try: