diff --git a/tests/python/bl_blendfile_versioning.py b/tests/python/bl_blendfile_versioning.py
index e8df684dab7..49c2892ba56 100644
--- a/tests/python/bl_blendfile_versioning.py
+++ b/tests/python/bl_blendfile_versioning.py
@@ -49,14 +49,17 @@ class TestBlendFileOpenAllTestFiles(TestHelper):
         self.excluded_dirs = ()
 
         if platform.system() == "Darwin":
-            if platform.machine() == "x86_64":
-                self.excluded_dirs = (
-                    *self.excluded_dirs,
-                    # The assert in `BKE_libblock_alloc_in_lib` often fails:
-                    # `BLI_assert(bmain->is_locked_for_linking == false || ELEM(type, ID_WS, ID_GR, ID_NT))`.
-                    # This needs to be investigated.
-                    "io_tests/blend_big_endian/",
-                )
+            # NOTE(@ideasman42):
+            # - `x86_64` fails often.
+            # - `arm64` can succeed but is unreliable enough to keep disabled.
+            # Keep both disabled.
+            self.excluded_dirs = (
+                *self.excluded_dirs,
+                # The assert in `BKE_libblock_alloc_in_lib` often fails:
+                # `BLI_assert(bmain->is_locked_for_linking == false || ELEM(type, ID_WS, ID_GR, ID_NT))`.
+                # This needs to be investigated.
+                "io_tests/blend_big_endian/",
+            )
 
         assert all(p.endswith("/") for p in self.excluded_dirs)
         self.excluded_dirs = tuple(p.replace("/", os.sep) for p in self.excluded_dirs)