diff --git a/pkgs/by-name/la/lash/package.nix b/pkgs/by-name/la/lash/package.nix
index c3ec6476b2a4..b5a69b2208f0 100644
--- a/pkgs/by-name/la/lash/package.nix
+++ b/pkgs/by-name/la/lash/package.nix
@@ -12,8 +12,6 @@
   readline,
 }:
 
-assert libuuid != null;
-
 stdenv.mkDerivation rec {
   pname = "lash";
   version = "0.5.4";
@@ -40,7 +38,9 @@ stdenv.mkDerivation rec {
     libxml2
     readline
   ];
-  propagatedBuildInputs = [ libuuid ];
+  propagatedBuildInputs =
+    assert libuuid != null;
+    [ libuuid ];
   NIX_LDFLAGS = "-lm -lpthread -luuid";
 
   postInstall = ''