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-rw-r--r--pkgs/applications/science/logic/fast-downward/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/applications/science/logic/fast-downward/default.nix b/pkgs/applications/science/logic/fast-downward/default.nix
index 1d7c51e64e9d4..ba0f3ee2e255f 100644
--- a/pkgs/applications/science/logic/fast-downward/default.nix
+++ b/pkgs/applications/science/logic/fast-downward/default.nix
@@ -21,7 +21,7 @@ stdenv.mkDerivation rec {
   nativeBuildInputs = [ cmake python3.pkgs.wrapPython ];
   buildInputs = [ python3 osi ];
 
-  cmakeFlags = lib.optional osi.withCplex [ "-DDOWNWARD_CPLEX_ROOT=${cplex}/cplex" ];
+  cmakeFlags = lib.optionals osi.withCplex [ "-DDOWNWARD_CPLEX_ROOT=${cplex}/cplex" ];
 
   configurePhase = ''
     python build.py release