diff --git a/CMakeLists.txt b/CMakeLists.txt
index 303dbff8..bb03ed90 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -82,6 +82,7 @@ add_subdirectory(xo-pyunit)
 add_subdirectory(xo-callback)
 add_subdirectory(xo-webutil)
 add_subdirectory(xo-pywebutil)
+add_subdirectory(xo-printjson)
 #
 add_subdirectory(xo-expression)
 add_subdirectory(xo-pyexpression)
@@ -90,7 +91,6 @@ add_subdirectory(xo-reader)
 add_subdirectory(xo-jit)
 add_subdirectory(xo-pyjit)
 #
-#add_subdirectory(xo-printjson)
 #add_subdirectory(xo-pyprintjson)
 #add_subdirectory(xo-reactor)
 #add_subdirectory(xo-pyreactor)
diff --git a/default.nix b/default.nix
index c659b221..cb9d7093 100644
--- a/default.nix
+++ b/default.nix
@@ -55,6 +55,7 @@ let
           xo-callback       = self.callPackage pkgs/xo-callback.nix       {};
           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-expression     = self.callPackage pkgs/xo-expression.nix     {};
           xo-pyexpression   = self.callPackage pkgs/xo-pyexpression.nix   {};
@@ -65,7 +66,6 @@ let
                                                                             clang = llvmPackages.clang;
                                                                             llvm = llvmPackages.llvm; };
           xo-pyjit          = self.callPackage pkgs/xo-pyjit.nix          {};
-#          xo-printjson      = self.callPackage pkgs/xo-printjson.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      {};
diff --git a/pkgs/xo-printjson.nix b/pkgs/xo-printjson.nix
new file mode 100644
index 00000000..dc17c7b2
--- /dev/null
+++ b/pkgs/xo-printjson.nix
@@ -0,0 +1,28 @@
+{
+  # nixpkgs dependencies
+  stdenv, cmake, catch2,
+
+  # xo dependencies
+  xo-cmake,
+#  xo-refcnt,
+  xo-reflect,
+    #, xo-indentlog,
+} :
+
+stdenv.mkDerivation (finalattrs:
+  {
+    name = "xo-printjson";
+
+    src = ../xo-printjson;
+
+    cmakeFlags = ["-DCMAKE_MODULE_PATH=${xo-cmake}/share/cmake"];
+    doCheck = true;
+    nativeBuildInputs = [
+      cmake catch2 xo-cmake
+    ];
+    propagatedBuildInputs = [
+#      xo-refcnt
+      xo-reflect
+#      xo-indentlog
+    ];
+  })
diff --git a/pkgs/xo-userenv.nix b/pkgs/xo-userenv.nix
index 82f98112..784d1f2c 100644
--- a/pkgs/xo-userenv.nix
+++ b/pkgs/xo-userenv.nix
@@ -40,7 +40,7 @@
   xo-callback,
   xo-webutil,
   xo-pywebutil,
-#  xo-printjson,
+  xo-printjson,
 #  xo-pyprintjson,
 #  xo-reactor,
 #  xo-pyreactor,
@@ -80,6 +80,7 @@ buildEnv {
             xo-callback
             xo-webutil
             xo-pywebutil
+            xo-printjson
 #
             xo-expression
             xo-pyexpression
@@ -87,7 +88,6 @@ buildEnv {
             xo-reader
             xo-jit
             xo-pyjit
-#            xo-printjson
 #            xo-pyprintjson
 #            xo-reactor
 #            xo-pyreactor