diff --git a/skimage/_shared/testing.py b/skimage/_shared/testing.py
index 301d25ec..779cbe5c 100644
--- a/skimage/_shared/testing.py
+++ b/skimage/_shared/testing.py
@@ -119,7 +119,7 @@ def color_check(plugin, fmt='png'):
     testing.assert_allclose(img2.astype(np.uint8), r2)
 
     img3 = img_as_float(img)
-    with expected_warnings(['precision loss|unclosed file']):
+    with expected_warnings(['precision loss']):
         r3 = roundtrip(img3, plugin, fmt)
     testing.assert_allclose(r3, img)
 
@@ -131,12 +131,12 @@ def color_check(plugin, fmt='png'):
             r4 = roundtrip(img4, plugin, fmt)
         testing.assert_allclose(r4, img4)
     else:
-        with expected_warnings(['sign loss|precision loss|unclosed file']):
+        with expected_warnings(['sign loss|precision loss']):
             r4 = roundtrip(img4, plugin, fmt)
             testing.assert_allclose(r4, img_as_ubyte(img4))
 
     img5 = img_as_uint(img)
-    with expected_warnings(['precision loss|unclosed file']):
+    with expected_warnings(['precision loss']):
         r5 = roundtrip(img5, plugin, fmt)
     testing.assert_allclose(r5, img)
 
@@ -156,14 +156,14 @@ def mono_check(plugin, fmt='png'):
     testing.assert_allclose(img2.astype(np.uint8), r2)
 
     img3 = img_as_float(img)
-    with expected_warnings(['precision|unclosed file|\A\Z']):
+    with expected_warnings(['precision|\A\Z']):
         r3 = roundtrip(img3, plugin, fmt)
     if r3.dtype.kind == 'f':
         testing.assert_allclose(img3, r3)
     else:
         testing.assert_allclose(r3, img_as_uint(img))
 
-    with expected_warnings(['precision loss|unclosed file']):
+    with expected_warnings(['precision loss']):
         img4 = img_as_int(img)
     if fmt.lower() in (('tif', 'tiff')):
         img4 -= 100
@@ -171,7 +171,7 @@ def mono_check(plugin, fmt='png'):
             r4 = roundtrip(img4, plugin, fmt)
         testing.assert_allclose(r4, img4)
     else:
-        with expected_warnings(['precision loss|sign loss|unclosed file']):
+        with expected_warnings(['precision loss|sign loss']):
             r4 = roundtrip(img4, plugin, fmt)
             testing.assert_allclose(r4, img_as_uint(img4))
 
diff --git a/skimage/io/tests/test_pil.py b/skimage/io/tests/test_pil.py
index cc00e19e..935dc6a7 100644
--- a/skimage/io/tests/test_pil.py
+++ b/skimage/io/tests/test_pil.py
@@ -160,7 +160,7 @@ def test_imsave_filelike():
     s = BytesIO()
 
     # save to file-like object
-    with expected_warnings(['precision loss|unclosed file',
+    with expected_warnings(['precision loss',
                             'is a low contrast image']):
         imsave(s, image)
 
@@ -230,9 +230,9 @@ class TestSaveTIF:
     def roundtrip(self, dtype, x, compress):
         with temporary_file(suffix='.tif') as fname:
             if dtype == np.bool:
-                expected = ['low contrast|unclosed file']
+                expected = ['low contrast']
             else:
-                expected = ['unclosed file|\A\Z']
+                expected = ['\A\Z']
             with expected_warnings(expected):
                 if compress > 0:
                     imsave(fname, x, compress=compress)