diff --git a/pkgs/development/python-modules/trio/default.nix b/pkgs/development/python-modules/trio/default.nix
index 0e95da38eaea..e667f146afc0 100644
--- a/pkgs/development/python-modules/trio/default.nix
+++ b/pkgs/development/python-modules/trio/default.nix
@@ -37,6 +37,10 @@ buildPythonPackage rec {
     "fallback_when_no_hook_claims_it"
   ];
 
+  pytestFlagsArray = [
+    "-W" "ignore::DeprecationWarning"
+  ];
+
   propagatedBuildInputs = [
     attrs
     sortedcontainers