diff --git a/pkgs/development/libraries/x265/default.nix b/pkgs/development/libraries/x265/default.nix
index b63b0101d54..2fb4f995fe4 100644
--- a/pkgs/development/libraries/x265/default.nix
+++ b/pkgs/development/libraries/x265/default.nix
@@ -17,7 +17,7 @@
 , custatsSupport ? false # Internal profiling of encoder work
 , debugSupport ? false # Run-time sanity checks (debugging)
 , ppaSupport ? false # PPA profiling instrumentation
-, unittestsSupport ? (stdenv.is64bit && !(stdenv.isDarwin && stdenv.isAarch64)) # Unit tests - only testing x64 assembly
+, unittestsSupport ? stdenv.isx86_64 # Unit tests - only testing x64 assembly
 , vtuneSupport ? false # Vtune profiling instrumentation
 , werrorSupport ? false # Warnings as errors
 }: