diff --git a/etc/centos/postinst b/etc/centos/postinst
index 34690b4..fd8218a 100644
--- a/etc/centos/postinst
+++ b/etc/centos/postinst
@@ -17,7 +17,7 @@ case "$1" in
 	chown owntracks:owntracks /etc/default/ot-recorder
 	chown -R owntracks:owntracks /var/spool/owntracks/
         chown owntracks:owntracks /usr/bin/ocat /usr/sbin/ot-recorder
-        chmod 4111 /usr/bin/ocat /usr/sbin/ot-recorder
+        chmod 4555 /usr/bin/ocat /usr/sbin/ot-recorder
         /usr/sbin/ot-recorder --initialize
 
 	if [ -x /bin/systemctl ]; then
diff --git a/etc/debian/postinst b/etc/debian/postinst
index 6b5a421..2707cc1 100644
--- a/etc/debian/postinst
+++ b/etc/debian/postinst
@@ -20,7 +20,7 @@ case "$1" in
 
 	chmod a+rX -R /usr/share/owntracks/
 
-        chmod 4111 /usr/bin/ocat /usr/sbin/ot-recorder
+        chmod 4555 /usr/bin/ocat /usr/sbin/ot-recorder
         /usr/sbin/ot-recorder --initialize
 
 
diff --git a/etc/raspbian/postinst b/etc/raspbian/postinst
index 9946fbf..28ab065 100644
--- a/etc/raspbian/postinst
+++ b/etc/raspbian/postinst
@@ -20,7 +20,7 @@ case "$1" in
 
 	chmod a+rX -R /usr/share/owntracks/
 
-        chmod 4111 /usr/bin/ocat /usr/sbin/ot-recorder
+        chmod 4555 /usr/bin/ocat /usr/sbin/ot-recorder
         /usr/sbin/ot-recorder --initialize