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Diffstat (limited to 'nixpkgs/pkgs/tools/security/b2sum/default.nix')
-rw-r--r--nixpkgs/pkgs/tools/security/b2sum/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/nixpkgs/pkgs/tools/security/b2sum/default.nix b/nixpkgs/pkgs/tools/security/b2sum/default.nix
index f9d2855e739f..16811d8f8897 100644
--- a/nixpkgs/pkgs/tools/security/b2sum/default.nix
+++ b/nixpkgs/pkgs/tools/security/b2sum/default.nix
@@ -15,7 +15,7 @@ stdenv.mkDerivation rec {
 
   buildInputs = [ openmp ];
 
-  buildFlags = [ (optional (isNull openmp) "NO_OPENMP=1") ];
+  buildFlags = [ (optional (openmp == null) "NO_OPENMP=1") ];
   installFlags = [ "PREFIX=$(out)" ];
 
   meta = {