diff --git a/main/Defaults.scala b/main/Defaults.scala
index 1a5fa4e81..2e828a42c 100755
--- a/main/Defaults.scala
+++ b/main/Defaults.scala
@@ -1225,6 +1225,8 @@ trait BuildExtra extends BuildCommon
 		def compose(setting: SettingKey[State => State], f: State => State) = setting in Global ~= (_ compose f)
 		Seq( compose(onLoad, add), compose(onUnload, remove) )
 	}
+	def addSbtPlugin(dependency: ModuleID, sbtVersion: String, scalaVersion: String): Setting[Seq[ModuleID]] =
+		libraryDependencies += sbtPluginExtra(dependency, sbtVersion, scalaVersion)
 	def addSbtPlugin(dependency: ModuleID, sbtVersion: String): Setting[Seq[ModuleID]] =
 		libraryDependencies <+= (scalaBinaryVersion in update) { scalaV => sbtPluginExtra(dependency, sbtVersion, scalaV) }
 	def addSbtPlugin(dependency: ModuleID): Setting[Seq[ModuleID]] =