diff --git a/Tests/helper.py b/Tests/helper.py
index 909fff879..ec61cd263 100644
--- a/Tests/helper.py
+++ b/Tests/helper.py
@@ -161,6 +161,12 @@ def assert_tuple_approx_equal(
             pytest.fail(msg + ": " + repr(actuals) + " != " + repr(targets))
 
 
+def timeout_unless_slower_valgrind(timeout: float) -> pytest.MarkDecorator:
+    if "PILLOW_VALGRIND_TEST" in os.environ:
+        return pytest.mark.pil_noop_mark()
+    return pytest.mark.timeout(timeout)
+
+
 def skip_unless_feature(feature: str) -> pytest.MarkDecorator:
     reason = f"{feature} not available"
     return pytest.mark.skipif(not features.check(feature), reason=reason)
diff --git a/Tests/test_file_pdf.py b/Tests/test_file_pdf.py
index bde1e3ab8..a2218673b 100644
--- a/Tests/test_file_pdf.py
+++ b/Tests/test_file_pdf.py
@@ -13,7 +13,12 @@ import pytest
 
 from PIL import Image, PdfParser, features
 
-from .helper import hopper, mark_if_feature_version, skip_unless_feature
+from .helper import (
+    hopper,
+    mark_if_feature_version,
+    skip_unless_feature,
+    timeout_unless_slower_valgrind,
+)
 
 
 def helper_save_as_pdf(tmp_path: Path, mode: str, **kwargs: Any) -> str:
@@ -339,8 +344,7 @@ def test_pdf_append_to_bytesio() -> None:
     assert len(f.getvalue()) > initial_size
 
 
-@pytest.mark.timeout(1)
-@pytest.mark.skipif("PILLOW_VALGRIND_TEST" in os.environ, reason="Valgrind is slower")
+@timeout_unless_slower_valgrind(1)
 @pytest.mark.parametrize("newline", (b"\r", b"\n"))
 def test_redos(newline: bytes) -> None:
     malicious = b" trailer<<>>" + newline * 3456
diff --git a/Tests/test_image.py b/Tests/test_image.py
index 7e6118d52..14a067127 100644
--- a/Tests/test_image.py
+++ b/Tests/test_image.py
@@ -34,6 +34,7 @@ from .helper import (
     is_win32,
     mark_if_feature_version,
     skip_unless_feature,
+    timeout_unless_slower_valgrind,
 )
 
 ElementTree: ModuleType | None
@@ -572,10 +573,7 @@ class TestImage:
         i = Image.new("RGB", [1, 1])
         assert isinstance(i.size, tuple)
 
-    @pytest.mark.timeout(0.75)
-    @pytest.mark.skipif(
-        "PILLOW_VALGRIND_TEST" in os.environ, reason="Valgrind is slower"
-    )
+    @timeout_unless_slower_valgrind(0.75)
     @pytest.mark.parametrize("size", ((0, 100000000), (100000000, 0)))
     def test_empty_image(self, size: tuple[int, int]) -> None:
         Image.new("RGB", size)