diff --git a/Dockerfile b/Dockerfile
index 4538b34..c47b3e7 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -38,7 +38,7 @@ COPY entrypoint.sh /docker-entrypoint.sh
 ADD https://raw.githubusercontent.com/stump/check_sshfp/master/check_sshfp /usr/lib/nagios/plugins/check_sshfp
 ADD https://raw.githubusercontent.com/matteocorti/check_ssl_cert/master/check_ssl_cert /usr/lib/nagios/plugins/check_ssl_cert
 ADD https://gist.githubusercontent.com/nemunaire/9669659/raw/977cfce7246249c17e213b0b2b231220257754fa/nagios-status.pl /usr/bin/nagios-status.pl
-RUN chmod +x /usr/lib/nagios/plugins/check_sshfp /usr/lib/nagios/plugins/check_ssl_cert /usr/bin/nagios-status.pl
+RUN chmod 755 /usr/lib/nagios/plugins/check_sshfp /usr/lib/nagios/plugins/check_ssl_cert /usr/bin/nagios-status.pl
 
 ENTRYPOINT ["/docker-entrypoint.sh"]
 USER nagios