diff --git a/CMakeLists.txt b/CMakeLists.txt
index bb03ed90..1f8cf7ab 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -83,6 +83,7 @@ add_subdirectory(xo-callback)
 add_subdirectory(xo-webutil)
 add_subdirectory(xo-pywebutil)
 add_subdirectory(xo-printjson)
+add_subdirectory(xo-pyprintjson)
 #
 add_subdirectory(xo-expression)
 add_subdirectory(xo-pyexpression)
@@ -91,7 +92,6 @@ add_subdirectory(xo-reader)
 add_subdirectory(xo-jit)
 add_subdirectory(xo-pyjit)
 #
-#add_subdirectory(xo-pyprintjson)
 #add_subdirectory(xo-reactor)
 #add_subdirectory(xo-pyreactor)
 #add_subdirectory(xo-websock)
diff --git a/default.nix b/default.nix
index cb9d7093..2fb7fc4d 100644
--- a/default.nix
+++ b/default.nix
@@ -56,6 +56,7 @@ let
           xo-webutil        = self.callPackage pkgs/xo-webutil.nix        {};
           xo-pywebutil      = self.callPackage pkgs/xo-pywebutil.nix      {};
           xo-printjson      = self.callPackage pkgs/xo-printjson.nix      {};
+          xo-pyprintjson    = self.callPackage pkgs/xo-pyprintjson.nix    {};
 #
           xo-expression     = self.callPackage pkgs/xo-expression.nix     {};
           xo-pyexpression   = self.callPackage pkgs/xo-pyexpression.nix   {};
@@ -66,7 +67,6 @@ let
                                                                             clang = llvmPackages.clang;
                                                                             llvm = llvmPackages.llvm; };
           xo-pyjit          = self.callPackage pkgs/xo-pyjit.nix          {};
-#          xo-pyprintjson    = self.callPackage pkgs/xo-pyprintjson.nix    {};
 #          xo-reactor        = self.callPackage pkgs/xo-reactor.nix        {};
 #          xo-pyreactor      = self.callPackage pkgs/xo-pyreactor.nix      {};
 #          xo-websock        = self.callPackage pkgs/xo-websock.nix        {};
diff --git a/pkgs/xo-pyprintjson.nix b/pkgs/xo-pyprintjson.nix
new file mode 100644
index 00000000..290c60f5
--- /dev/null
+++ b/pkgs/xo-pyprintjson.nix
@@ -0,0 +1,31 @@
+{
+  # nixpkgs dependencies
+  stdenv, cmake, catch2,
+
+  #python3Packages,
+
+  # xo dependencies
+  xo-cmake,
+  #xo-refcnt,
+  xo-printjson,
+
+  xo-pyreflect,
+} :
+
+stdenv.mkDerivation (finalattrs:
+  {
+    name = "xo-pyprintjson";
+
+    src = ../xo-pyprintjson;
+
+    cmakeFlags = ["-DCMAKE_MODULE_PATH=${xo-cmake}/share/cmake"];
+    #doCheck = true;
+    nativeBuildInputs = [ cmake catch2 xo-cmake ];
+    propagatedBuildInputs = [
+      xo-printjson
+      xo-pyreflect
+#      xo-refcnt
+#      python3Packages.python
+#      python3Packages.pybind11
+    ];
+  })
diff --git a/pkgs/xo-userenv.nix b/pkgs/xo-userenv.nix
index 784d1f2c..e097c985 100644
--- a/pkgs/xo-userenv.nix
+++ b/pkgs/xo-userenv.nix
@@ -41,7 +41,7 @@
   xo-webutil,
   xo-pywebutil,
   xo-printjson,
-#  xo-pyprintjson,
+  xo-pyprintjson,
 #  xo-reactor,
 #  xo-pyreactor,
 #  xo-simulator,
@@ -88,7 +88,7 @@ buildEnv {
             xo-reader
             xo-jit
             xo-pyjit
-#            xo-pyprintjson
+            xo-pyprintjson
 #            xo-reactor
 #            xo-pyreactor
 #            xo-websock