diff --git a/tests/su/02/config.txt b/tests/su/02/config.txt
index aecff4a9..70dfcd2f 100644
--- a/tests/su/02/config.txt
+++ b/tests/su/02/config.txt
@@ -1,3 +1,5 @@
 # no testsuite password
 # root password: rootF00barbaz
 # myuser password: myuserF00barbaz
+
+# /etc/profile is empty to avoid interferences.
diff --git a/tests/su/02/config/etc/profile b/tests/su/02/config/etc/profile
new file mode 100644
index 00000000..e69de29b