diff --git a/main/src/main/scala/sbt/Defaults.scala b/main/src/main/scala/sbt/Defaults.scala
index f6a6037fd..e8925e217 100644
--- a/main/src/main/scala/sbt/Defaults.scala
+++ b/main/src/main/scala/sbt/Defaults.scala
@@ -3347,7 +3347,7 @@ object Classpaths {
     }
     val p3 = releaseNotesURL.value match {
       case Some(u) =>
-        p1.extra("info.releaseNotesUrl" -> u.toExternalForm)
+        p2.extra("info.releaseNotesUrl" -> u.toExternalForm)
       case _ => p2
     }
     p3