diff --git a/.github/workflows/check_lesson_04_pr.yml b/.github/workflows/check_lesson_04_pr.yml
new file mode 100644
index 00000000..6d7a8ac8
--- /dev/null
+++ b/.github/workflows/check_lesson_04_pr.yml
@@ -0,0 +1,32 @@
+name: Check Lesson 04 Pull Request
+
+on:
+  pull_request:
+    branches: [ "main" ]
+    paths:
+      - "lesson_04/expression/**"
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up JDK 17
+      uses: actions/setup-java@v4
+      with:
+        java-version: '17'
+        distribution: 'temurin'
+
+    # Configure Gradle for optimal use in GiHub Actions, including caching of downloaded dependencies.
+    # See: https://github.com/gradle/actions/blob/main/setup-gradle/README.md
+    - name: Setup Gradle
+      uses: gradle/actions/setup-gradle@417ae3ccd767c252f5661f1ace9f835f9654f2b5 # v3.1.0
+
+    - name: Build Lesson 04 with Gradle Wrapper
+      working-directory: ./lesson_04/expression
+      run: ./gradlew check
+