diff --git a/pkgs/development/libraries/x265/default.nix b/pkgs/development/libraries/x265/default.nix
index 736c350bc06880..0a287363e67c71 100644
--- a/pkgs/development/libraries/x265/default.nix
+++ b/pkgs/development/libraries/x265/default.nix
@@ -26,6 +26,8 @@ stdenv.mkDerivation rec {
     sha256 = "1j0mbcf10aj6zi1nxql45f9817jd2ndcpd7x123sjmyr7q9m8iiy";
   };
 
+  enableParallelBuilding = true;
+
   patchPhase = ''
     sed -i 's/unknown/${version}/g' source/cmake/version.cmake
   '';