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-rw-r--r--pkgs/applications/science/math/cplex/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/applications/science/math/cplex/default.nix b/pkgs/applications/science/math/cplex/default.nix
index dae5e1b76d3..dc0e9ea1aa5 100644
--- a/pkgs/applications/science/math/cplex/default.nix
+++ b/pkgs/applications/science/math/cplex/default.nix
@@ -12,7 +12,7 @@ stdenv.mkDerivation rec {
   version = "128";
   
   src =
-    if builtins.isNull releasePath then
+    if releasePath == null then
       throw ''
         This nix expression requires that the cplex installer is already
         downloaded to your machine. Get it from IBM: