diff --git a/pkgs/development/libraries/p11-kit/default.nix b/pkgs/development/libraries/p11-kit/default.nix
index 721ab154cf4f..79aed33e8ac2 100644
--- a/pkgs/development/libraries/p11-kit/default.nix
+++ b/pkgs/development/libraries/p11-kit/default.nix
@@ -67,7 +67,7 @@ stdenv.mkDerivation rec {
     ))
   ];
 
-  mesonCheckFlags = [
+  ${if stdenv.buildPlatform.isDarwin && stdenv.buildPlatform.isx86_64 then "mesonCheckFlags" else null} = [
     # Tests regularly exceed the default timeout on `x86_64-darwin`.
     "--timeout-multiplier=0"
   ];