diff --git a/akka-docs-dev/rst/scala/code/docs/http/scaladsl/server/directives/ParameterDirectivesExamplesSpec.scala b/akka-docs-dev/rst/scala/code/docs/http/scaladsl/server/directives/ParameterDirectivesExamplesSpec.scala
old mode 100644
new mode 100755
index 42c4785dc1..036bbb2c12
--- a/akka-docs-dev/rst/scala/code/docs/http/scaladsl/server/directives/ParameterDirectivesExamplesSpec.scala
+++ b/akka-docs-dev/rst/scala/code/docs/http/scaladsl/server/directives/ParameterDirectivesExamplesSpec.scala
@@ -192,9 +192,9 @@ class ParameterDirectivesExamplesSpec extends RoutingSpec with PredefinedFromStr
       responseAs[String] shouldEqual "The parameters are x = '1', x = '2'"
     }
   }
-  "csv" in {
+  "csv string sequence" in {
     val route =
-      parameter("names".as(CsvString)) { names =>
+      parameter("names".as(CsvStringSeq)) { names =>
         complete(s"The parameters are ${names.mkString(", ")}")
       }
 
@@ -206,4 +206,48 @@ class ParameterDirectivesExamplesSpec extends RoutingSpec with PredefinedFromStr
       responseAs[String] shouldEqual "The parameters are Caplin, John"
     }
   }
+  "csv byte sequence" in {
+    val route =
+      parameter("numbers".as(CsvByteSeq)) { bytes =>
+        complete(s"The numbers are ${bytes.mkString(", ")}")
+      }
+
+    // tests:
+    Get(s"/?numbers=2,${Byte.MaxValue}") ~> route ~> check {
+      responseAs[String] shouldEqual s"The numbers are 2, ${Byte.MaxValue}"
+    }
+  }
+  "csv short sequence" in {
+    val route =
+      parameter("numbers".as(CsvShortSeq)) { shorts =>
+        complete(s"The numbers are ${shorts.mkString(", ")}")
+      }
+
+    // tests:
+    Get(s"/?numbers=2,${Short.MaxValue}") ~> route ~> check {
+      responseAs[String] shouldEqual s"The numbers are 2, ${Short.MaxValue}"
+    }
+  }
+  "csv int sequence" in {
+    val route =
+      parameter("numbers".as(CsvIntSeq)) { ints =>
+        complete(s"The numbers are ${ints.mkString(", ")}")
+      }
+
+    // tests:
+    Get(s"/?numbers=2,${Int.MaxValue}") ~> route ~> check {
+      responseAs[String] shouldEqual s"The numbers are 2, ${Int.MaxValue}"
+    }
+  }
+  "csv long sequence" in {
+    val route =
+      parameter("numbers".as(CsvLongSeq)) { longs =>
+        complete(s"The numbers are ${longs.mkString(", ")}")
+      }
+
+    // tests:
+    Get(s"/?numbers=2,${Long.MaxValue}") ~> route ~> check {
+      responseAs[String] shouldEqual s"The numbers are 2, ${Long.MaxValue}"
+    }
+  }
 }
diff --git a/akka-http-tests/src/test/scala/akka/http/scaladsl/server/directives/ParameterDirectivesSpec.scala b/akka-http-tests/src/test/scala/akka/http/scaladsl/server/directives/ParameterDirectivesSpec.scala
old mode 100644
new mode 100755
index fbca6989e3..c4332e0f00
--- a/akka-http-tests/src/test/scala/akka/http/scaladsl/server/directives/ParameterDirectivesSpec.scala
+++ b/akka-http-tests/src/test/scala/akka/http/scaladsl/server/directives/ParameterDirectivesSpec.scala
@@ -7,7 +7,7 @@ package directives
 
 import org.scalatest.{ FreeSpec, Inside }
 import akka.http.scaladsl.unmarshalling.Unmarshaller.HexInt
-import akka.http.scaladsl.unmarshalling.Unmarshaller.CsvString
+import akka.http.scaladsl.unmarshalling.Unmarshaller.CsvStringSeq
 
 class ParameterDirectivesSpec extends FreeSpec with GenericRoutingSpec with Inside {
   "when used with 'as[Int]' the parameter directive should" - {
@@ -53,9 +53,9 @@ class ParameterDirectivesSpec extends FreeSpec with GenericRoutingSpec with Insi
     }
   }
 
-  "when used with 'as(CsvString)' the parameter directive should" - {
+  "when used with 'as(CsvStringSeq)' the parameter directive should" - {
     val route =
-      parameter("names".as(CsvString)) { names ⇒
+      parameter("names".as(CsvStringSeq)) { names ⇒
         complete(s"The parameters are ${names.mkString(", ")}")
       }
 
diff --git a/akka-http/src/main/scala/akka/http/scaladsl/unmarshalling/PredefinedFromStringUnmarshallers.scala b/akka-http/src/main/scala/akka/http/scaladsl/unmarshalling/PredefinedFromStringUnmarshallers.scala
old mode 100644
new mode 100755
index 8894ce96d3..ff0b635796
--- a/akka-http/src/main/scala/akka/http/scaladsl/unmarshalling/PredefinedFromStringUnmarshallers.scala
+++ b/akka-http/src/main/scala/akka/http/scaladsl/unmarshalling/PredefinedFromStringUnmarshallers.scala
@@ -9,28 +9,16 @@ import scala.collection.immutable
 trait PredefinedFromStringUnmarshallers {
 
   implicit val byteFromStringUnmarshaller: Unmarshaller[String, Byte] =
-    Unmarshaller.strict[String, Byte] { string ⇒
-      try string.toByte
-      catch numberFormatError(string, "8-bit signed integer")
-    }
+    Unmarshaller.strict(byteFromString)
 
   implicit val shortFromStringUnmarshaller: Unmarshaller[String, Short] =
-    Unmarshaller.strict[String, Short] { string ⇒
-      try string.toShort
-      catch numberFormatError(string, "16-bit signed integer")
-    }
+    Unmarshaller.strict(shortFromString)
 
   implicit val intFromStringUnmarshaller: Unmarshaller[String, Int] =
-    Unmarshaller.strict[String, Int] { string ⇒
-      try string.toInt
-      catch numberFormatError(string, "32-bit signed integer")
-    }
+    Unmarshaller.strict(intFromString)
 
   implicit val longFromStringUnmarshaller: Unmarshaller[String, Long] =
-    Unmarshaller.strict[String, Long] { string ⇒
-      try string.toLong
-      catch numberFormatError(string, "64-bit signed integer")
-    }
+    Unmarshaller.strict(longFromString)
 
   val HexByte: Unmarshaller[String, Byte] =
     Unmarshaller.strict[String, Byte] { string ⇒
@@ -78,11 +66,39 @@ trait PredefinedFromStringUnmarshallers {
       }
     }
 
-  val CsvString: Unmarshaller[String, immutable.Seq[String]] =
+  val CsvStringSeq: Unmarshaller[String, immutable.Seq[String]] =
     Unmarshaller.strict[String, immutable.Seq[String]] { string ⇒
       string.split(",").toList
     }
 
+  val CsvByteSeq: Unmarshaller[String, immutable.Seq[Byte]] =
+    CsvStringSeq.map(_.map(byteFromString))
+
+  val CsvShortSeq: Unmarshaller[String, immutable.Seq[Short]] =
+    CsvStringSeq.map(_.map(shortFromString))
+
+  val CsvIntSeq: Unmarshaller[String, immutable.Seq[Int]] =
+    CsvStringSeq.map(_.map(intFromString))
+
+  val CsvLongSeq: Unmarshaller[String, immutable.Seq[Long]] =
+    CsvStringSeq.map(_.map(longFromString))
+
+  private def byteFromString(string: String) =
+    try string.toByte
+    catch numberFormatError(string, "8-bit signed integer")
+
+  private def shortFromString(string: String) =
+    try string.toShort
+    catch numberFormatError(string, "16-bit signed integer")
+
+  private def intFromString(string: String) =
+    try string.toInt
+    catch numberFormatError(string, "32-bit signed integer")
+
+  private def longFromString(string: String) =
+    try string.toLong
+    catch numberFormatError(string, "64-bit signed integer")
+
   private def numberFormatError(value: String, target: String): PartialFunction[Throwable, Nothing] = {
     case e: NumberFormatException ⇒
       throw if (value.isEmpty) Unmarshaller.NoContentException else new IllegalArgumentException(s"'$value' is not a valid $target value", e)