diff --git a/check_imap_starttls.sh b/check_imap_starttls.sh
index 9bf1c84..9b53f85 100755
--- a/check_imap_starttls.sh
+++ b/check_imap_starttls.sh
@@ -78,7 +78,7 @@ EOT
 }
 
 # Test if openssl is installed
-openssl -h 2> /dev/null
+openssl help 2> /dev/null
 if [ $? != 0 ]; then
     echo "There is a problem with your OpenSSL program"
     exit $STATE_UNKNOWN