diff --git a/tests/corelib/corelib.status b/tests/corelib/corelib.status
index 97150c2d9cd..ecde5a5c7c3 100644
--- a/tests/corelib/corelib.status
+++ b/tests/corelib/corelib.status
@@ -2,6 +2,8 @@
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
+bigint_parse_radix_test/3: Slow # Issue http://dartbug.com/47050
+
 [ $compiler == dartdevk ]
 regexp/lookbehind_test/01: Skip # Flaky in uncatchable way.  Issue 36280
 
diff --git a/tests/corelib_2/corelib_2.status b/tests/corelib_2/corelib_2.status
index 726b58f8e1b..3ee1d12e81e 100644
--- a/tests/corelib_2/corelib_2.status
+++ b/tests/corelib_2/corelib_2.status
@@ -2,6 +2,8 @@
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
+bigint_parse_radix_test/3: Slow # Issue http://dartbug.com/47050
+
 [ $compiler == dartdevk ]
 regexp/lookbehind_test/01: Skip # Flaky in uncatchable way.  Issue 36280