diff --git a/src/index.ts b/src/index.ts
index 26b773c..624a9d0 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -188,6 +188,13 @@ export class TurborepoProject extends typescript.TypeScriptProject {
     */
     this.addDevDeps('turbo')
 
+    /**
+     * Adds package manager to prevent turbo warnings
+     *
+     * @see https://turborepo.org/docs/reference/codemods#turborepo-1x
+    */
+    this.package.addField('packageManager', this.package.packageManager)
+
     /**
      * Finally, turborepo config.
      *
diff --git a/test/synth.test.ts b/test/synth.test.ts
index aa4bcc9..4d41d3e 100644
--- a/test/synth.test.ts
+++ b/test/synth.test.ts
@@ -11,7 +11,6 @@ describe('TurborepoProject', () => {
     expect(synth['package.json'].devDependencies).toHaveProperty('turbo')
   })
 
-
   it('should add itself as a development dependency', () => {
     expect.assertions(1)
 
@@ -21,6 +20,15 @@ describe('TurborepoProject', () => {
     expect(synth['package.json'].devDependencies).toHaveProperty('projen-turborepo')
   })
 
+  it('should add packageManager prop', () => {
+    expect.assertions(1)
+
+    const project = createProject()
+    const synth = synthProjectSnapshot(project)
+
+    expect(synth['package.json'].packageManager).toBe('yarn')
+  })
+
   it('should set root package as private', () => {
     expect.assertions(1)