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-rw-r--r--pkgs/development/perl-modules/XML-Parser/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/development/perl-modules/XML-Parser/default.nix b/pkgs/development/perl-modules/XML-Parser/default.nix
index 0c0311962ba1..79bad03171ec 100644
--- a/pkgs/development/perl-modules/XML-Parser/default.nix
+++ b/pkgs/development/perl-modules/XML-Parser/default.nix
@@ -1,6 +1,6 @@
 {stdenv, fetchurl, perl, expat}:
 
-assert !isNull perl && !isNull expat;
+assert perl != null && expat != null;
 
 derivation {
   name = "perl-XML-Parser-2.34";