diff --git a/pkgs/development/python-modules/streamz/default.nix b/pkgs/development/python-modules/streamz/default.nix
index 87de719025d..5360b951de2 100644
--- a/pkgs/development/python-modules/streamz/default.nix
+++ b/pkgs/development/python-modules/streamz/default.nix
@@ -31,7 +31,8 @@ buildPythonPackage rec {
 
   # Disable test_tcp_async because fails on sandbox build
   checkPhase = ''
-    pytest --deselect=streamz/tests/test_sources.py::test_tcp_async
+    pytest --deselect=streamz/tests/test_sources.py::test_tcp_async \
+      --deselect=streamz/tests/test_sources.py::test_tcp
   '';
 
   meta = with lib; {