diff --git a/src/main/scala/net/kemitix/s3thorp/Config.scala b/src/main/scala/net/kemitix/s3thorp/Config.scala
index fad09e1..92d9bf0 100644
--- a/src/main/scala/net/kemitix/s3thorp/Config.scala
+++ b/src/main/scala/net/kemitix/s3thorp/Config.scala
@@ -1,8 +1,8 @@
 package net.kemitix.s3thorp
 
-case class Config(bucket: String,
-                  prefix: String,
-                  source: String
+case class Config(bucket: String = "",
+                  prefix: String = "",
+                  source: String = ""
                ) {
 
 }
diff --git a/src/main/scala/net/kemitix/s3thorp/ParseArgs.scala b/src/main/scala/net/kemitix/s3thorp/ParseArgs.scala
index 9654563..58c8394 100644
--- a/src/main/scala/net/kemitix/s3thorp/ParseArgs.scala
+++ b/src/main/scala/net/kemitix/s3thorp/ParseArgs.scala
@@ -6,8 +6,6 @@ import cats.effect.IO
 
 object ParseArgs {
 
-  val defaultConfig = Config("def-bucket", "def-prefix", "def-source")
-
   val configParser: OParser[Unit, Config] = {
     val parserBuilder = builder[Config]
     import parserBuilder._
@@ -27,7 +25,7 @@ object ParseArgs {
   }
 
   def apply(args: List[String]): IO[Config] =
-    parse(configParser, args, defaultConfig) match {
+    parse(configParser, args, Config()) match {
       case Some(config) => IO.pure(config)
       case _ => IO.raiseError(new IllegalArgumentException)
     }