diff --git a/pkgs/build-support/dotnet/build-dotnet-module/fetch-deps.sh b/pkgs/build-support/dotnet/build-dotnet-module/fetch-deps.sh
index c8d428240621..ff971ce1e592 100644
--- a/pkgs/build-support/dotnet/build-dotnet-module/fetch-deps.sh
+++ b/pkgs/build-support/dotnet/build-dotnet-module/fetch-deps.sh
@@ -4,6 +4,8 @@ tmp=$(mktemp -d)
 trap 'chmod -R +w "$tmp" && rm -fr "$tmp"' EXIT
 
 HOME=$tmp/.home
+export TMPDIR="$tmp/.tmp"
+mkdir "$HOME" "$TMPDIR"
 cd "$tmp"
 
 phases="