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-rw-r--r--pkgs/build-support/dotnet/build-dotnet-module/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/build-support/dotnet/build-dotnet-module/default.nix b/pkgs/build-support/dotnet/build-dotnet-module/default.nix
index 0e9cd21a3b3..16e27188671 100644
--- a/pkgs/build-support/dotnet/build-dotnet-module/default.nix
+++ b/pkgs/build-support/dotnet/build-dotnet-module/default.nix
@@ -214,7 +214,7 @@ stdenvNoCC.mkDerivation (args // {
         if [[ ''${TMPDIR:-} == /run/user/* ]]; then
            # /run/user is usually a tmpfs in RAM, which may be too small
            # to store all downloaded dotnet packages
-           TMPDIR=
+           unset TMPDIR
         fi
 
         export tmp=$(mktemp -td "deps-${pname}-XXXXXX")