diff --git a/.github/workflows/validation.yml b/.github/workflows/validation.yml
index 3b8b3e9f8..a23aa0890 100644
--- a/.github/workflows/validation.yml
+++ b/.github/workflows/validation.yml
@@ -39,14 +39,21 @@ jobs:
             - run: npm install
 
             - name: Get modified files
-              if: github.event_name == 'pull_request'
+              
               id: files
               run: |
                   echo "changed_files=$(git diff --name-only HEAD~1 HEAD | xargs)" >> $GITHUB_OUTPUT
                   echo $changed_files
 
+            - name: Get all modified domain JSON files
+              if: github.event_name == 'pull_request'
+              id: changed-files
+              uses: tj-actions/changed-files@v45
+              with:
+                  files: domains/*.json
+
             - run: npm test
               env:
                   EVENT: ${{ github.event_name }}
                   PR_AUTHOR: ${{ github.event.pull_request.user.login }}
-                  MODIFIED_FILES: ${{ steps.files.outputs.changed_files || '' }}
+                  MODIFIED_FILES: ${{ steps.changed-files.outputs.all_changed_files }}
diff --git a/tests/pr.test.js b/tests/pr.test.js
index b29d1bc1a..e588a2ba1 100644
--- a/tests/pr.test.js
+++ b/tests/pr.test.js
@@ -3,7 +3,7 @@ const fs = require("fs-extra");
 const path = require("path");
 
 const PR_AUTHOR = process.env.PR_AUTHOR;
-const MODIFIED_FILES = process.env.MODIFIED_FILES.split(",");
+const MODIFIED_FILES = process.env.MODIFIED_FILES.split("\n");
 
 const domainsPath = path.resolve("domains");