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-rw-r--r--pkgs/development/tools/parsing/bison/bison-new.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/development/tools/parsing/bison/bison-new.nix b/pkgs/development/tools/parsing/bison/bison-new.nix
index b8e3596e7943..43f66ce06a9c 100644
--- a/pkgs/development/tools/parsing/bison/bison-new.nix
+++ b/pkgs/development/tools/parsing/bison/bison-new.nix
@@ -1,6 +1,6 @@
 {stdenv, fetchurl, m4}:
 
-assert !isNull m4;
+assert m4 != null;
 
 derivation {
   name = "bison-1.875c";