diff --git a/tests/functional/restricted.sh b/tests/functional/restricted.sh
index e0c3fe773..450674bd6 100644
--- a/tests/functional/restricted.sh
+++ b/tests/functional/restricted.sh
@@ -4,7 +4,7 @@ clearStore
 
 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); rm $TMPFILE
 nix-instantiate --restrict-eval ./simple.nix -I src=.
 nix-instantiate --restrict-eval ./simple.nix -I src1=simple.nix -I src2=config.nix -I src3=./simple.builder.sh