diff --git a/Tests/test_file_libtiff.py b/Tests/test_file_libtiff.py
index 66855bb97..4414dbe5e 100644
--- a/Tests/test_file_libtiff.py
+++ b/Tests/test_file_libtiff.py
@@ -272,7 +272,7 @@ class TestFileLibTiff(LibTiffTestCase):
         }
 
         libtiffs = [False]
-        if Image.core.libtiff_v4_or_greater:
+        if Image.core.libtiff_support_custom_tags:
             libtiffs.append(True)
 
         for libtiff in libtiffs:
diff --git a/src/PIL/TiffImagePlugin.py b/src/PIL/TiffImagePlugin.py
index a78f791ee..fa8c852c2 100644
--- a/src/PIL/TiffImagePlugin.py
+++ b/src/PIL/TiffImagePlugin.py
@@ -1556,7 +1556,7 @@ def _save(im, fp, filename):
             if tag not in TiffTags.LIBTIFF_CORE:
                 if (
                     TiffTags.lookup(tag).type == TiffTags.UNDEFINED
-                    or not Image.core.libtiff_v4_or_greater
+                    or not Image.core.libtiff_support_custom_tags
                 ):
                     continue
 
diff --git a/src/_imaging.c b/src/_imaging.c
index 12c07f0ad..190b312bc 100644
--- a/src/_imaging.c
+++ b/src/_imaging.c
@@ -3969,13 +3969,13 @@ setup_module(PyObject* m) {
     PyDict_SetItemString(d, "libtiff_version", PyUnicode_FromString(ImagingTiffVersion()));
 
     // Test for libtiff 4.0 or later, excluding libtiff 3.9.6 and 3.9.7
-    PyObject* v4_or_greater;
+    PyObject* support_custom_tags;
 #if TIFFLIB_VERSION >= 20111221 && TIFFLIB_VERSION != 20120218 && TIFFLIB_VERSION != 20120922
-    v4_or_greater = Py_True;
+    support_custom_tags = Py_True;
 #else
-    v4_or_greater = Py_False;
+    support_custom_tags = Py_False;
 #endif
-    PyDict_SetItemString(d, "libtiff_v4_or_greater", v4_or_greater);
+    PyDict_SetItemString(d, "libtiff_support_custom_tags", support_custom_tags);
   }
 #endif