diff --git a/libvirt.spec.in b/libvirt.spec.in
index 00b95b89ed..545990c548 100644
--- a/libvirt.spec.in
+++ b/libvirt.spec.in
@@ -1,9 +1,10 @@
 # -*- rpm-spec -*-
 
-# This spec file assumes you are building for Fedora 20 or newer,
-# or for RHEL 6 or newer. It may need some tweaks for other distros.
+# This spec file assumes you are building on a Fedora or RHEL version
+# that's still supported by the vendor: that means Fedora 23 or newer,
+# or RHEL 6 or newer. It may need some tweaks for other distros.
 # If neither fedora nor rhel was defined, try to guess them from dist
-%if (0%{?fedora} && 0%{?fedora} >= 20) || (0%{?rhel} && 0%{?rhel} >= 6)
+%if (0%{?fedora} && 0%{?fedora} >= 23) || (0%{?rhel} && 0%{?rhel} >= 6)
     %define supported_platform 1
 %else
     %define supported_platform 0
@@ -167,7 +168,7 @@
 %endif
 
 # Enable wireshark plugins for all distros shipping libvirt 1.2.2 or newer
-%if 0%{?fedora} >= 21
+%if 0%{?fedora}
     %define with_wireshark 0%{!?_without_wireshark:1}
 %endif
 
@@ -209,7 +210,7 @@
 %if 0%{?fedora} >= 25
     %define tls_priority "@LIBVIRT,SYSTEM"
 %else
-    %if 0%{?fedora} >= 21
+    %if 0%{?fedora}
         %define tls_priority "@SYSTEM"
     %else
         %define tls_priority "NORMAL"