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-rw-r--r--pkgs/applications/video/MPlayer/default.nix4
1 files changed, 2 insertions, 2 deletions
diff --git a/pkgs/applications/video/MPlayer/default.nix b/pkgs/applications/video/MPlayer/default.nix
index d2b089bbb85f..a064162d8804 100644
--- a/pkgs/applications/video/MPlayer/default.nix
+++ b/pkgs/applications/video/MPlayer/default.nix
@@ -1,8 +1,8 @@
 { alsaSupport ? false
 , stdenv, fetchurl, x11, freetype, alsa ? null}:
 
-assert !isNull x11 && !isNull freetype;
-assert alsaSupport -> !isNull alsa;
+assert x11 != null && freetype != null;
+assert alsaSupport -> alsa != null;
 
 derivation {
   name = "MPlayer-1.0pre3";