diff --git a/tests/restyle.py b/tests/restyle.py
index d0477c2099..8e87be439d 100755
--- a/tests/restyle.py
+++ b/tests/restyle.py
@@ -86,7 +86,7 @@ def find_arduino_files():
 class Changed:
     file: str
     hunk: list[str]
-    lines: list[str]
+    lines: list[int]
 
 
 @dataclass
@@ -122,7 +122,9 @@ def reset_with_line(ctx, line):
 
     def pop(out, context, line):
         if ctx.file and ctx.hunk and ctx.markers:
-            out.append(Changed(ctx.file, "\n".join(ctx.hunk), ", ".join(ctx.markers)))
+            out.append(
+                Changed(file=ctx.file, hunk="\n".join(ctx.hunk), lines=ctx.markers)
+            )
 
         reset_with_line(context, line)
 
@@ -157,7 +159,7 @@ def pop(out, context, line):
             numbers = numbers.replace("+", "")
             numbers = numbers.replace("-", "")
 
-            ctx.markers.append(numbers)
+            ctx.markers.append(int(numbers))
             ctx.append_hunk = True
 
         # capture diff for the summary
@@ -169,10 +171,12 @@ def pop(out, context, line):
     return out
 
 
-def warning_changed(changed: Changed):
-    print(
-        f"::warning file={changed.file},title=Run tests/restyle.sh and re-commit {changed.file}::File {changed.file} failed clang-format style check. (lines {changed.lines})"
-    )
+def errors_changed(changed: Changed):
+    all_lines = ", ".join(str(x) for x in changed.lines)
+    for line in changed.lines:
+        print(
+            f"::error file={changed.file},title=Run tests/restyle.sh and re-commit {changed.file},line={line}::File {changed.file} failed clang-format style check. (lines {all_lines})"
+        )
 
 
 SUMMARY_PATH = pathlib.Path(os.environ.get("GITHUB_STEP_SUMMARY", os.devnull))
@@ -214,8 +218,8 @@ def run_format(args):
 
 def run_assert(args):
     for changed in changed_files():
-        if args.with_warnings:
-            warning_changed(changed)
+        if args.with_errors:
+            errors_changed(changed)
         if args.with_summary:
             summary_diff(changed)
 
@@ -246,7 +250,7 @@ def run_assert(args):
     assert_ = cmd.add_parser("assert")
     assert_.set_defaults(func=run_assert)
     assert_.add_argument("--with-summary", action="store_true")
-    assert_.add_argument("--with-warnings", action="store_true")
+    assert_.add_argument("--with-errors", action="store_true")
 
     args = parser.parse_args()
     args.func(args)
diff --git a/tests/restyle.sh b/tests/restyle.sh
index 3e554fa5fb..09f0b81163 100755
--- a/tests/restyle.sh
+++ b/tests/restyle.sh
@@ -13,4 +13,4 @@ CLANG_FORMAT=${CLANG_FORMAT:-clang-format-15}
 
 cd $root
 python $root/tests/restyle.py format --clang-format=$CLANG_FORMAT preset --include core --include arduino
-python $root/tests/restyle.py assert --with-summary --with-warnings
+python $root/tests/restyle.py assert --with-summary --with-errors