diff --git a/compile/interface/src/main/scala/xsbt/CompilerInterface.scala b/compile/interface/src/main/scala/xsbt/CompilerInterface.scala
index 9efed98cb..c4a81c9ec 100644
--- a/compile/interface/src/main/scala/xsbt/CompilerInterface.scala
+++ b/compile/interface/src/main/scala/xsbt/CompilerInterface.scala
@@ -144,7 +144,7 @@ private final class CachedCompiler0(args: Array[String], output: Output, initial
 
 	val compiler: Compiler = {
 		if (command.settings.Yrangepos.value)
-			new Compiler() with RangePositions
+			new Compiler() with RangePositions // unnecessary in 2.11
 		else
 			new Compiler()
 	}