diff --git a/tests/test_fips.py b/tests/test_fips.py
index abf98560..211090f1 100644
--- a/tests/test_fips.py
+++ b/tests/test_fips.py
@@ -327,14 +327,14 @@ def test_icainfo_binary(container_per_test: ContainerData) -> None:
 )
 def test_nss_firefox_cert(container_per_test: ContainerData) -> None:
     container_per_test.connection.check_output(
-        "zypper -n install mozilla-nss mozilla-nss-tools"
+        "zypper -n install mozilla-nss-tools"
     )
     # Seed file
     container_per_test.connection.check_output(
-        "cat /dev/urandom | head -n 120 > seedfile.dat"
+        "dd if=/dev/urandom bs=1k count=32767 of=seedfile.dat"
     )
     # Empty password
-    container_per_test.connection.check_output('echo "" > password.txt')
+    container_per_test.connection.check_output('touch password.txt')
     # Create database, needed prerequisite, needs one <enter> as interaction
     assert (
         container_per_test.connection.check_output(