diff --git a/CMakeLists.txt b/CMakeLists.txt
index 917119c3..20d7f332 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -87,6 +87,7 @@ add_subdirectory(xo-pyprintjson)
 add_subdirectory(xo-reactor)
 add_subdirectory(xo-pyreactor)
 add_subdirectory(xo-websock)
+add_subdirectory(xo-pywebsock)
 #
 add_subdirectory(xo-expression)
 add_subdirectory(xo-pyexpression)
@@ -95,7 +96,6 @@ add_subdirectory(xo-reader)
 add_subdirectory(xo-jit)
 add_subdirectory(xo-pyjit)
 #
-#add_subdirectory(xo-pywebsock)
 #add_subdirectory(xo-statistics)
 #add_subdirectory(xo-distribution)
 #add_subdirectory(xo-pydistribution)
diff --git a/default.nix b/default.nix
index b87710e5..0ef1b6e7 100644
--- a/default.nix
+++ b/default.nix
@@ -60,6 +60,7 @@ let
           xo-reactor        = self.callPackage pkgs/xo-reactor.nix        {};
           xo-pyreactor      = self.callPackage pkgs/xo-pyreactor.nix      {};
           xo-websock        = self.callPackage pkgs/xo-websock.nix        {};
+          xo-pywebsock      = self.callPackage pkgs/xo-pywebsock.nix      {};
 #
           xo-expression     = self.callPackage pkgs/xo-expression.nix     {};
           xo-pyexpression   = self.callPackage pkgs/xo-pyexpression.nix   {};
@@ -70,7 +71,6 @@ let
                                                                             clang = llvmPackages.clang;
                                                                             llvm = llvmPackages.llvm; };
           xo-pyjit          = self.callPackage pkgs/xo-pyjit.nix          {};
-#          xo-pywebsock      = self.callPackage pkgs/xo-pywebsock.nix      {};
 #          xo-statistics     = self.callPackage pkgs/xo-statistics.nix     {};
 #          xo-distribution   = self.callPackage pkgs/xo-distribution.nix   {};
 #          xo-pydistribution = self.callPackage pkgs/xo-pydistribution.nix {};
diff --git a/pkgs/xo-pywebsock.nix b/pkgs/xo-pywebsock.nix
new file mode 100644
index 00000000..0a20ecd3
--- /dev/null
+++ b/pkgs/xo-pywebsock.nix
@@ -0,0 +1,33 @@
+{
+  # nixpkgs dependencies
+  stdenv, cmake, catch2,
+
+  python3Packages,
+
+  # xo dependencies
+  xo-cmake,
+  #xo-refcnt,
+  xo-websock,
+
+  xo-pyreflect,
+  xo-pywebutil
+} :
+
+stdenv.mkDerivation (finalattrs:
+  {
+    name = "xo-pywebsock";
+
+    src = ../xo-pywebsock;
+
+    cmakeFlags = ["-DCMAKE_MODULE_PATH=${xo-cmake}/share/cmake"];
+    #doCheck = true;
+    nativeBuildInputs = [ cmake catch2 xo-cmake ];
+    propagatedBuildInputs = [
+#      xo-printjson
+      xo-pywebutil
+      xo-pyreflect
+      xo-websock
+#      python3Packages.python
+#      python3Packages.pybind11
+    ];
+  })
diff --git a/pkgs/xo-userenv.nix b/pkgs/xo-userenv.nix
index 58482a32..04fd84fa 100644
--- a/pkgs/xo-userenv.nix
+++ b/pkgs/xo-userenv.nix
@@ -45,10 +45,10 @@
   xo-reactor,
   xo-pyreactor,
   xo-websock,
+  xo-pywebsock,
 #  xo-simulator,
 #  xo-pysimulator, xo-distribution, xo-pydistribution, xo-process, xo-pyprocess, xo-statistics, xo-kalmanfilter,
   #  xo-pykalmanfilter,
-#  xo-pywebsock,
 
   xo-expression,
   xo-pyexpression,
@@ -94,7 +94,7 @@ buildEnv {
             xo-reactor
             xo-pyreactor
             xo-websock
-#            xo-pywebsock
+            xo-pywebsock
 #            xo-statistics
 #            xo-distribution
 #            xo-pydistribution
diff --git a/xo-pywebsock/CMakeLists.txt b/xo-pywebsock/CMakeLists.txt
index 56e9f2eb..37b10b60 100644
--- a/xo-pywebsock/CMakeLists.txt
+++ b/xo-pywebsock/CMakeLists.txt
@@ -5,7 +5,7 @@ project(xo_pywebsock VERSION 1.0)
 
 include(cmake/xo-bootstrap-macros.cmake)
 
-xo_cxx_toplevel_options()
+xo_cxx_toplevel_options3()
 
 add_subdirectory(src/pywebsock)