diff --git a/build.sbt b/build.sbt
index a92b450..2e2683f 100644
--- a/build.sbt
+++ b/build.sbt
@@ -92,7 +92,8 @@ lazy val scalacOptions_2_13 = Seq(
   "-Xfatal-warnings",
   "-Xlint:strict-unsealed-patmat",
   "-Ymacro-annotations",
-  "-Ywarn-dead-code"
+  "-Ywarn-dead-code",
+  "-Xsource:3"
 )
 
 lazy val sonatypeSettings = {