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-rw-r--r--pkgs/stdenv/adapters.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/stdenv/adapters.nix b/pkgs/stdenv/adapters.nix
index 7823d6413442..a384e5470e48 100644
--- a/pkgs/stdenv/adapters.nix
+++ b/pkgs/stdenv/adapters.nix
@@ -128,7 +128,7 @@ rec {
      with the following function:
 
      isFree = license: with builtins;
-       if isNull license then true
+       if license == null then true
        else if isList license then lib.all isFree license
        else license != "non-free" && license != "unfree";