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-rw-r--r--lib/trivial.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/trivial.nix b/lib/trivial.nix
index 2d682961035f9..f2710a6f0338d 100644
--- a/lib/trivial.nix
+++ b/lib/trivial.nix
@@ -112,7 +112,7 @@ rec {
     # Function to call
     f:
     # Argument to check for null before passing it to `f`
-    a: if isNull a then a else f a;
+    a: if a == null then a else f a;
 
   # Pull in some builtins not included elsewhere.
   inherit (builtins)