diff --git a/dvc/render/utils.py b/dvc/render/utils.py
index c9f227c79..6734ac65d 100644
--- a/dvc/render/utils.py
+++ b/dvc/render/utils.py
@@ -1,13 +1,14 @@
 import os.path
-from typing import Dict, List, Set
+from typing import Dict, List
 
 
-def get_files(data: Dict) -> Set:
+def get_files(data: Dict) -> List:
     files = set()
     for rev in data.keys():
         for file in data[rev].get("data", {}).keys():
             files.add(file)
-    return files
+    sorted_files = sorted(files)
+    return sorted_files
 
 
 def group_by_filename(plots_data: Dict) -> List[Dict]:
diff --git a/tests/unit/test_plots.py b/tests/unit/test_plots.py
index 49ec95f58..306cb822c 100644
--- a/tests/unit/test_plots.py
+++ b/tests/unit/test_plots.py
@@ -28,9 +28,9 @@ def test_plots_order(tmp_dir, dvc):
             name="stage2",
         )
 
-    assert get_files(dvc.plots.show()) == {
+    assert get_files(dvc.plots.show()) == [
         "p.json",
-        os.path.join("sub", "p4.json"),
         "p1.json",
         os.path.join("sub", "p3.json"),
-    }
+        os.path.join("sub", "p4.json"),
+    ]