diff --git a/pkgs/xo-userenv.nix b/pkgs/xo-userenv.nix
index 93cd0864..8dfce6c7 100644
--- a/pkgs/xo-userenv.nix
+++ b/pkgs/xo-userenv.nix
@@ -3,7 +3,7 @@
   buildFHSUserEnv, # ... other deps here
 
   # xo dependencies
-  xo-cmake, xo-indentlog, xo-subsys, xo-refcnt, xo-ratio, xo-reflect, xo-unit,
+  xo-cmake, xo-indentlog, xo-flatstring, xo-subsys, xo-refcnt, xo-ratio, xo-reflect, xo-randomgen, xo-unit,
 
   # other args
 
@@ -14,10 +14,12 @@ buildFHSUserEnv {
   name = "xo-userenv";
   targetPkgs = pkgs: [ xo-cmake
                        xo-indentlog
+                       xo-flatstring
                        xo-subsys
                        xo-refcnt
                        xo-ratio
                        xo-reflect
+                       xo-randomgen
                        xo-unit
                      ];
   # runScript = ...;