diff --git a/include/tests_crypto b/include/tests_crypto
index d4a90cc2..61074cdc 100644
--- a/include/tests_crypto
+++ b/include/tests_crypto
@@ -245,7 +245,7 @@
     if [ ${SKIPTEST} -eq 0 ]; then
         LogText "Test: looking for ${ROOTDIR}sys/class/misc/hw_random/rng_current"
         if [ -f "${ROOTDIR}sys/class/misc/hw_random/rng_current" ]; then
-            DATA=$(${HEADBINARY} --lines=1 ${ROOTDIR}sys/class/misc/hw_random/rng_current | ${TRBINARY} -d '[[:cntrl:]]')
+            DATA=$(${HEADBINARY} -n 1 ${ROOTDIR}sys/class/misc/hw_random/rng_current | ${TRBINARY} -d '[[:cntrl:]]')
             if [ "${DATA}" != "none" ]; then
                 LogText "Result: positive match, found RNG: ${DATA}"
                 if IsRunning "rngd"; then