diff --git a/main/Defaults.scala b/main/Defaults.scala
index d07711807..b4c8a24e4 100755
--- a/main/Defaults.scala
+++ b/main/Defaults.scala
@@ -841,8 +841,9 @@ object Classpaths
 		}
 	)
 	def warnResolversConflict(ress: Seq[Resolver], log: Logger) {
-		for ((name, r) <- ress groupBy (_.name) if r.size > 1) {
-			log.warn("Multiple resolvers configured with the name '" + name + "'. To avoid conflict, Remove duplicate project resolvers (`resolvers`) or rename publishing resolver (`publishTo`).")
+		val resset = ress.toSet
+		for ((name, r) <- resset groupBy (_.name) if r.size > 1) {
+			log.warn("Multiple resolvers having different access mechanism configured with same name '" + name + "'. To avoid conflict, Remove duplicate project resolvers (`resolvers`) or rename publishing resolver (`publishTo`).")
 		}
 	}
 	def pluginProjectID: Initialize[ModuleID] = (sbtVersion in update, sbtBinaryVersion in update, scalaVersion in update, scalaBinaryVersion in update, projectID, sbtPlugin) {