diff --git a/testsuite/sysctl.test/sysctl_write.exp b/testsuite/sysctl.test/sysctl_write.exp
index 5a74decd..bf0923f4 100644
--- a/testsuite/sysctl.test/sysctl_write.exp
+++ b/testsuite/sysctl.test/sysctl_write.exp
@@ -27,3 +27,7 @@ if {[file exists ${hostname_file}]} {
 } else {
   unsupported "sysctl write: hostname file doe not exist"
 }
+
+set test "sysctl write above /proc"
+spawn $sysctl /../../../etc=1
+expect_pass "$test" "sysctl: Path is not under /proc/sys/: /proc/sys//../../../etc"