diff --git a/Tests/test_file_dcx.py b/Tests/test_file_dcx.py
index 5deacd878..ab6b9f983 100644
--- a/Tests/test_file_dcx.py
+++ b/Tests/test_file_dcx.py
@@ -26,12 +26,12 @@ def test_sanity() -> None:
 
 @pytest.mark.skipif(is_pypy(), reason="Requires CPython")
 def test_unclosed_file() -> None:
-    def open() -> None:
+    def open_test_image() -> None:
         im = Image.open(TEST_FILE)
         im.load()
 
     with pytest.warns(ResourceWarning):
-        open()
+        open_test_image()
 
 
 def test_closed_file() -> None:
diff --git a/Tests/test_file_fli.py b/Tests/test_file_fli.py
index 876561a88..8adbd30f5 100644
--- a/Tests/test_file_fli.py
+++ b/Tests/test_file_fli.py
@@ -52,12 +52,12 @@ def test_prefix_chunk(monkeypatch: pytest.MonkeyPatch) -> None:
 
 @pytest.mark.skipif(is_pypy(), reason="Requires CPython")
 def test_unclosed_file() -> None:
-    def open() -> None:
+    def open_test_image() -> None:
         im = Image.open(static_test_file)
         im.load()
 
     with pytest.warns(ResourceWarning):
-        open()
+        open_test_image()
 
 
 def test_closed_file() -> None:
diff --git a/Tests/test_file_im.py b/Tests/test_file_im.py
index 1d3fa485f..d29998801 100644
--- a/Tests/test_file_im.py
+++ b/Tests/test_file_im.py
@@ -31,12 +31,12 @@ def test_name_limit(tmp_path: Path) -> None:
 
 @pytest.mark.skipif(is_pypy(), reason="Requires CPython")
 def test_unclosed_file() -> None:
-    def open() -> None:
+    def open_test_image() -> None:
         im = Image.open(TEST_IM)
         im.load()
 
     with pytest.warns(ResourceWarning):
-        open()
+        open_test_image()
 
 
 def test_closed_file() -> None:
diff --git a/Tests/test_file_mpo.py b/Tests/test_file_mpo.py
index 66fa29177..311085cf7 100644
--- a/Tests/test_file_mpo.py
+++ b/Tests/test_file_mpo.py
@@ -38,12 +38,12 @@ def test_sanity(test_file: str) -> None:
 
 @pytest.mark.skipif(is_pypy(), reason="Requires CPython")
 def test_unclosed_file() -> None:
-    def open() -> None:
+    def open_test_image() -> None:
         im = Image.open(test_files[0])
         im.load()
 
     with pytest.warns(ResourceWarning):
-        open()
+        open_test_image()
 
 
 def test_closed_file() -> None:
diff --git a/Tests/test_file_psd.py b/Tests/test_file_psd.py
index 5f22001f3..1793c269d 100644
--- a/Tests/test_file_psd.py
+++ b/Tests/test_file_psd.py
@@ -25,12 +25,12 @@ def test_sanity() -> None:
 
 @pytest.mark.skipif(is_pypy(), reason="Requires CPython")
 def test_unclosed_file() -> None:
-    def open() -> None:
+    def open_test_image() -> None:
         im = Image.open(test_file)
         im.load()
 
     with pytest.warns(ResourceWarning):
-        open()
+        open_test_image()
 
 
 def test_closed_file() -> None:
diff --git a/Tests/test_file_spider.py b/Tests/test_file_spider.py
index 713db848d..cdb7b3e0b 100644
--- a/Tests/test_file_spider.py
+++ b/Tests/test_file_spider.py
@@ -24,12 +24,12 @@ def test_sanity() -> None:
 
 @pytest.mark.skipif(is_pypy(), reason="Requires CPython")
 def test_unclosed_file() -> None:
-    def open() -> None:
+    def open_test_image() -> None:
         im = Image.open(TEST_FILE)
         im.load()
 
     with pytest.warns(ResourceWarning):
-        open()
+        open_test_image()
 
 
 def test_closed_file() -> None:
diff --git a/Tests/test_file_tiff.py b/Tests/test_file_tiff.py
index fe8f69848..a8a407963 100644
--- a/Tests/test_file_tiff.py
+++ b/Tests/test_file_tiff.py
@@ -63,12 +63,12 @@ class TestFileTiff:
 
     @pytest.mark.skipif(is_pypy(), reason="Requires CPython")
     def test_unclosed_file(self) -> None:
-        def open() -> None:
+        def open_test_image() -> None:
             im = Image.open("Tests/images/multipage.tiff")
             im.load()
 
         with pytest.warns(ResourceWarning):
-            open()
+            open_test_image()
 
     def test_closed_file(self) -> None:
         with warnings.catch_warnings():