diff --git a/lib/tasks/plugin.rake b/lib/tasks/plugin.rake
index 8e7281ad592..acb8e5b1d7c 100644
--- a/lib/tasks/plugin.rake
+++ b/lib/tasks/plugin.rake
@@ -47,7 +47,7 @@ desc 'run plugin specs'
 task 'plugin:spec', :plugin do |t, args|
   args.with_defaults(plugin: "*")
   ruby = `which ruby`.strip
-  files = Dir.glob("./plugins/#{args[:plugin]}/spec/**/*.rb")
+  files = Dir.glob("./plugins/#{args[:plugin]}/spec/**/*_spec.rb")
   if files.length > 0
     sh "LOAD_PLUGINS=1 #{ruby} -S rspec #{files.join(' ')}"
   else