diff --git a/test/system/099-scfilter b/test/system/099-scfilter
index 6b098ac..7be02bd 100755
--- a/test/system/099-scfilter
+++ b/test/system/099-scfilter
@@ -6,7 +6,7 @@ check_chronyd_features SCFILTER || test_skip "SCFILTER support disabled"
 
 test_start "system call filter in non-destructive tests"
 
-for level in "-1" "1" "-2" "2"; do
+for level in 1 2 -1 -2; do
 	test_message 1 1 "level $level:"
 	for test in 0[0-8][0-9]-*[^_]; do
 		test_message 2 0 "$test"
diff --git a/test/system/199-scfilter b/test/system/199-scfilter
index 29b7cc3..40441b7 100755
--- a/test/system/199-scfilter
+++ b/test/system/199-scfilter
@@ -6,7 +6,7 @@ check_chronyd_features SCFILTER || test_skip "SCFILTER support disabled"
 
 test_start "system call filter in destructive tests"
 
-for level in "-1" "1" "-2" "2"; do
+for level in 1 2 -1 -2; do
 	test_message 1 1 "level $level:"
 	for test in 1[0-8][0-9]-*[^_]; do
 		test_message 2 0 "$test"