diff --git a/irc/flock/flock.go b/irc/flock/flock.go
index 42d89270..5f4f5913 100644
--- a/irc/flock/flock.go
+++ b/irc/flock/flock.go
@@ -1,4 +1,4 @@
-//go:build !plan9
+//go:build !(plan9 || solaris)
 
 package flock
 
diff --git a/irc/flock/flock_plan9.go b/irc/flock/flock_unsupported.go
similarity index 79%
rename from irc/flock/flock_plan9.go
rename to irc/flock/flock_unsupported.go
index 06ffeb7c..8cb5e587 100644
--- a/irc/flock/flock_plan9.go
+++ b/irc/flock/flock_unsupported.go
@@ -1,4 +1,4 @@
-//go:build plan9
+//go:build plan9 || solaris
 
 package flock