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-rw-r--r--src/libexpr/fetchurl.nix4
1 files changed, 2 insertions, 2 deletions
diff --git a/src/libexpr/fetchurl.nix b/src/libexpr/fetchurl.nix
index b487e959a..9d1b61d7f 100644
--- a/src/libexpr/fetchurl.nix
+++ b/src/libexpr/fetchurl.nix
@@ -38,6 +38,6 @@ derivation ({
# To make "nix-prefetch-url" work.
urls = [ url ];
-} // (if __impure
- then { inherit __impure; }
+} // (if impure
+ then { __impure = true; }
else { inherit outputHashAlgo outputHash; }))