diff --git a/test/mjsunit/mjsunit.status b/test/mjsunit/mjsunit.status
index 8ffcafce69..b7b0c774c4 100644
--- a/test/mjsunit/mjsunit.status
+++ b/test/mjsunit/mjsunit.status
@@ -142,3 +142,8 @@ regress/regress-create-exception: SKIP
 regress/regress-3218915: SKIP
 regress/regress-3247124: SKIP
 
+
+[ $isolates ]
+# d8-os writes temporary files that might interfer with each other when running
+# in multible threads. Skip this if running with isolates testing.
+d8-os: SKIP
diff --git a/tools/test.py b/tools/test.py
index d09f275e5b..ec21ffed94 100755
--- a/tools/test.py
+++ b/tools/test.py
@@ -1442,7 +1442,8 @@ def Main():
         'system': utils.GuessOS(),
         'arch': options.arch,
         'simulator': options.simulator,
-        'crankshaft': options.crankshaft
+        'crankshaft': options.crankshaft,
+        'isolates': options.isolates
       }
       test_list = root.ListTests([], path, context, mode, [])
       unclassified_tests += test_list