diff --git a/distros/redhat/zoneminder.spec b/distros/redhat/zoneminder.spec
index 9e4fd2951..fa188bf28 100644
--- a/distros/redhat/zoneminder.spec
+++ b/distros/redhat/zoneminder.spec
@@ -128,7 +128,7 @@ Requires: zip
 %{systemd_requires}
 
 Requires(post): %{_bindir}/gpasswd
-Requires(post): %{_bindir}/less
+Requires(post): %{_bindir}/chown
 
 %description common
 ZoneMinder is a set of applications which is intended to provide a complete
@@ -250,6 +250,9 @@ echo -e "\nVERY IMPORTANT: Before starting ZoneMinder, you must read the README
 echo -e "\nThe README file is located here: %{_pkgdocdir}-common/README\n"
 
 %post httpd
+# For the case of changing from nginx <-> httpd, existing php session files must change ownership
+%{_bindir}/chown -R %{zmuid_final}:%{zmgid_final} %{_sharedstatedir}/php/session/ >/dev/null 2>&1 || :
+
 ln -sf %{_sysconfdir}/zm/www/com.zoneminder.systemctl.rules.httpd %{_datadir}/polkit-1/rules.d/com.zoneminder.systemctl.rules
 # backwards compatibility
 ln -sf %{_sysconfdir}/zm/www/zoneminder.httpd.conf %{_sysconfdir}/zm/www/zoneminder.conf
@@ -264,6 +267,9 @@ ln -sf %{_sysconfdir}/zm/www/zoneminder.httpd.conf %{_sysconfdir}/zm/www/zonemin
 # We could override the folder permission, but adding nginx to the apache group works better
 %{_bindir}/gpasswd -a nginx apache >/dev/null 2>&1 || :
 
+# For the case of changing from httpd <-> nginx, existing php session files must change ownership
+%{_bindir}/chown -R nginx:nginx %{_sharedstatedir}/php/session/ >/dev/null 2>&1 || :
+
 ln -sf %{_sysconfdir}/zm/www/com.zoneminder.systemctl.rules.nginx %{_datadir}/polkit-1/rules.d/com.zoneminder.systemctl.rules
 # backwards compatibility
 ln -sf %{_sysconfdir}/zm/www/zoneminder.nginx.conf %{_sysconfdir}/zm/www/zoneminder.conf