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-rw-r--r--pkgs/development/libraries/libdvdread/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/development/libraries/libdvdread/default.nix b/pkgs/development/libraries/libdvdread/default.nix
index 6c4f782d237b..11da28b6f854 100644
--- a/pkgs/development/libraries/libdvdread/default.nix
+++ b/pkgs/development/libraries/libdvdread/default.nix
@@ -1,6 +1,6 @@
 {stdenv, fetchurl, libdvdcss}:
 
-assert !isNull libdvdcss;
+assert libdvdcss != null;
 
 derivation {
   name = "libdvdread-20030812";