diff --git a/.travis.yml b/.travis.yml
index c9549444..42ea3f81 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -24,6 +24,7 @@ matrix:
         grep: stable
       filter_secrets: false  # Secrets will otherwise break Windows builds
       node_js: latest
+      install: npm install
       script: npm run test:ava
 
 env:
diff --git a/test/rollup/rollup.test.ts b/test/rollup/rollup.test.ts
index c77c1216..4afbf910 100644
--- a/test/rollup/rollup.test.ts
+++ b/test/rollup/rollup.test.ts
@@ -27,8 +27,10 @@ test("can be bundled using rollup", async t => {
     })
   ])
 
-  const result = await execa.command("puppet-run --serve ./dist/worker.js:/worker.js ./dist/app.js", {
-    cwd: __dirname,
+  const result = await execa.command("puppet-run --serve ./test/rollup/dist/worker.js:/worker.js ./test/rollup/dist/app.js", {
+    cwd: path.resolve(__dirname, "..", ".."),
+    localDir: path.resolve(__dirname, "..", ".."),
+    preferLocal: true,
     stderr: process.stderr
   })
   t.is(result.exitCode, 0)
diff --git a/test/tsconfig/minimal-tsconfig.test.ts b/test/tsconfig/minimal-tsconfig.test.ts
index bd1a1a75..eb58c5ae 100644
--- a/test/tsconfig/minimal-tsconfig.test.ts
+++ b/test/tsconfig/minimal-tsconfig.test.ts
@@ -1,7 +1,12 @@
 import test from "ava"
 import execa from "execa"
+import * as path from "path"
 
 test("can compile with a minimal TypeScript config", async t => {
-  const result = await execa("tsc", ["--project", require.resolve("./minimal-tsconfig.json")])
+  const result = await execa("tsc", ["--project", require.resolve("./minimal-tsconfig.json")], {
+    cwd: path.resolve(__dirname, "..", ".."),
+    localDir: path.resolve(__dirname, "..", ".."),
+    preferLocal: true
+  })
   t.is(result.exitCode, 0, `tsc exited with non-zero exit code.\nStderr:\n${result.stderr}`)
 })