diff --git a/tests/functional/nars.sh b/tests/functional/nars.sh
index 28876e497c7..39d9389dbbe 100755
--- a/tests/functional/nars.sh
+++ b/tests/functional/nars.sh
@@ -88,17 +88,50 @@ touch "$TEST_ROOT/case/xt_CONNMARK.h~nix~case~hack~3"
 rm -rf "$TEST_ROOT/case"
 expectStderr 1 nix-store "${opts[@]}" --restore "$TEST_ROOT/case" < case-collision.nar | grepQuiet "NAR contains file name 'test' that collides with case-hacked file name 'Test~nix~case~hack~1'"
 
-# Deserializing a NAR that contains file names that Unicode-normalize
-# to the same name should fail on macOS but succeed on Linux.
-rm -rf "$TEST_ROOT/out"
-if [[ $(uname) = Darwin ]]; then
-    expectStderr 1 nix-store --restore "$TEST_ROOT/out" < unnormalized.nar | grepQuiet "path '.*/out/â' already exists"
-else
-    nix-store --restore "$TEST_ROOT/out" < unnormalized.nar
+# Deserializing a NAR that contains file names that Unicode-normalize to the
+# same name should fail on macOS and specific Linux setups (typically ZFS with
+# `utf8only` enabled and `normalization` set to anything else than `none`). The
+# deserialization should succeed on most Linux, where file names aren't
+# unicode-normalized.
+#
+# We test that:
+#
+# 1. It either succeeds or fails with "already exists" error.
+# 2. Nix has the same behavior with respect to unicode normalization than
+#    $TEST_ROOT's filesystem (when using basic Unix commands)
+rm -rf "$TEST_ROOT/out"
+set +e
+unicodeTestOut=$(nix-store --restore "$TEST_ROOT/out" < unnormalized.nar 2>&1)
+unicodeTestCode=$?
+set -e
+
+touch "$TEST_ROOT/unicode-â" # non-canonical version
+touch "$TEST_ROOT/unicode-â"
+
+touchFilesCount=$(find "$TEST_ROOT" -maxdepth 1 -name "unicode-*" -type f | wc -l)
+
+if (( unicodeTestCode == 1 )); then
+    # If the command failed (MacOS or ZFS + normalization), checks that it failed
+    # with the expected "already exists" error, and that this is the same
+    # behavior as `touch`
+    echo "$unicodeTestOut" | grepQuiet "path '.*/out/â' already exists"
+
+    (( touchFilesCount == 1 ))
+elif (( unicodeTestCode == 0 )); then
+    # If the command succeeded, check that both files are present, and that this
+    # is the same behavior as `touch`
     [[ -e $TEST_ROOT/out/â ]]
     [[ -e $TEST_ROOT/out/â ]]
+
+    (( touchFilesCount == 2 ))
+else
+    # if the return code is neither 0 or 1, fail the test.
+    echo "NAR deserialization of files with the same Unicode normalization failed with unexpected return code $unicodeTestCode" >&2
+    exit 1
 fi
 
+rm -f "$TEST_ROOT/unicode-*"
+
 # Unpacking a NAR with a NUL character in a file name should fail.
 rm -rf "$TEST_ROOT/out"
 expectStderr 1 nix-store --restore "$TEST_ROOT/out" < nul.nar | grepQuiet "NAR contains invalid file name 'f"