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-rw-r--r--pkgs/development/libraries/libxml2/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/development/libraries/libxml2/default.nix b/pkgs/development/libraries/libxml2/default.nix
index 4eb33f53d012..7533451029e3 100644
--- a/pkgs/development/libraries/libxml2/default.nix
+++ b/pkgs/development/libraries/libxml2/default.nix
@@ -1,6 +1,6 @@
 {stdenv, fetchurl, zlib}:
 
-assert !isNull zlib;
+assert zlib != null;
 
 derivation {
   name = "libxml2-2.6.7";