diff --git a/tclhttpd.spec b/tclhttpd.spec
index e702cc2..017be5f 100644
--- a/tclhttpd.spec
+++ b/tclhttpd.spec
@@ -25,6 +25,8 @@ Requires(post): systemd-sysv
 Requires(post): systemd-units
 Requires(preun): systemd-units
 Requires(postun): systemd-units
+Conflicts: systemd < 38
+Conflicts: filesystem < 3
 
 %description
 TclHttpd is a Web server implemented in pure Tcl. It works out of the box as a