diff --git a/tests/functional/restricted.sh b/tests/functional/restricted.sh
index 00ee4ddc8..c13d42850 100755
--- a/tests/functional/restricted.sh
+++ b/tests/functional/restricted.sh
@@ -6,7 +6,7 @@ clearStoreIfPossible
 
 nix-instantiate --restrict-eval --eval -E '1 + 2'
 (! nix-instantiate --eval --restrict-eval ./restricted.nix)
-(! nix-instantiate --eval --restrict-eval <(echo '1 + 2'))
+TMPFILE=$(mktemp) && echo '1 + 2' >$TMPFILE && (! nix-instantiate --eval --restrict-eval $TMPFILE)
 
 mkdir -p "$TEST_ROOT/nix"
 cp ./simple.nix "$TEST_ROOT/nix"