diff --git a/nbdkit.spec b/nbdkit.spec
index b0a6385..2427d1e 100644
--- a/nbdkit.spec
+++ b/nbdkit.spec
@@ -206,6 +206,8 @@ Summary:        Example plugins for %{name}
 License:        BSD
 
 Requires:       %{name}-server%{?_isa} = %{version}-%{release}
+# example4 is written in Perl.
+Requires:       %{name}-perl-plugin
 
 
 %description example-plugins