diff --git a/scalafmt-core/shared/src/main/scala/org/scalafmt/config/ScalafmtConfig.scala b/scalafmt-core/shared/src/main/scala/org/scalafmt/config/ScalafmtConfig.scala
index 75eeb491db..5935af59fa 100644
--- a/scalafmt-core/shared/src/main/scala/org/scalafmt/config/ScalafmtConfig.scala
+++ b/scalafmt-core/shared/src/main/scala/org/scalafmt/config/ScalafmtConfig.scala
@@ -400,8 +400,9 @@ object ScalafmtConfig {
       }
       docstrings.validate
       if (errors.nonEmpty) {
-        val prefix = s"newlines.source=${newlines.source} and ["
-        allErrors += errors.mkString(prefix, ",", "]")
+        allErrors += s"newlines.source=${newlines.source} and ["
+        errors.foreach(x => allErrors += "\t" + x)
+        allErrors += "]"
       }
     }
     locally {