diff --git a/compile/inc/Incremental.scala b/compile/inc/Incremental.scala
index 4124b1565..5e3a7ecb4 100644
--- a/compile/inc/Incremental.scala
+++ b/compile/inc/Incremental.scala
@@ -11,7 +11,7 @@ import java.io.File
 
 object Incremental
 {
-	def println(s: String) = ()
+	def println(s: String) = if(java.lang.Boolean.getBoolean("xsbt.inc.debug")) System.out.println(s) else ()
 	def compile(sources: Set[File], previous: Analysis, current: ReadStamps, externalAPI: String => Source, doCompile: Set[File] => Analysis)(implicit equivS: Equiv[Stamp]): Analysis =
 	{
 		val initialChanges = changedInitial(sources, previous.stamps, previous.apis, current, externalAPI)