diff --git a/pkgs/development/libraries/libtoxcore/default.nix b/pkgs/development/libraries/libtoxcore/default.nix
index 1a93c53785b..d569cf28c37 100644
--- a/pkgs/development/libraries/libtoxcore/default.nix
+++ b/pkgs/development/libraries/libtoxcore/default.nix
@@ -44,8 +44,13 @@ stdenv.mkDerivation rec {
 
   propagatedBuildInputs = stdenv.lib.optionals (!stdenv.isArm) [ libvpx ];
 
-  # Some tests fail in the Sheevaplug due to timeout
-  doCheck = !stdenv.isArm;
+  # Some tests fail randomly due to timeout. This kind of problem is well known
+  # by upstream: https://github.com/irungentoo/toxcore/issues/{950,1054}
+  # They don't recommend running tests on 50core machines with other cpu-bound
+  # tests running in parallel.
+  #
+  # NOTE: run the tests locally on your machine before upgrading this package!
+  doCheck = false;
 
   meta = with stdenv.lib; {
     description = "P2P FOSS instant messaging application aimed to replace Skype with crypto";