diff --git a/main/src/main/scala/sbt/Defaults.scala b/main/src/main/scala/sbt/Defaults.scala
index d103829ae..2bc1c71ff 100755
--- a/main/src/main/scala/sbt/Defaults.scala
+++ b/main/src/main/scala/sbt/Defaults.scala
@@ -2364,6 +2364,7 @@ object Classpaths {
     ),
     ivySbt := ivySbt0.value,
     ivyModule := { val is = ivySbt.value; new is.Module(moduleSettings.value) },
+    allCredentials := LMCoursier.allCredentialsTask.value,
     transitiveUpdate := transitiveUpdateTask.value,
     updateCacheName := {
       val binVersion = scalaBinaryVersion.value
diff --git a/main/src/main/scala/sbt/Keys.scala b/main/src/main/scala/sbt/Keys.scala
index b50013d8c..242b75579 100644
--- a/main/src/main/scala/sbt/Keys.scala
+++ b/main/src/main/scala/sbt/Keys.scala
@@ -376,6 +376,7 @@ object Keys {
   val packagedArtifacts = taskKey[Map[Artifact, File]]("Packages all artifacts for publishing and maps the Artifact definition to the generated file.").withRank(CTask)
   val publishMavenStyle = settingKey[Boolean]("Configures whether to generate and publish a pom (true) or Ivy file (false).").withRank(BSetting)
   val credentials = taskKey[Seq[Credentials]]("The credentials to use for updating and publishing.").withRank(BMinusTask)
+  val allCredentials = taskKey[Seq[Credentials]]("Aggregated credentials across current and root subprojects. Do not rewire this task.").withRank(DTask)
 
   val makePom = taskKey[File]("Generates a pom for publishing when publishing Maven-style.").withRank(BPlusTask)
   val deliver = taskKey[File]("Generates the Ivy file for publishing to a repository.").withRank(BTask)
diff --git a/main/src/main/scala/sbt/coursierint/CoursierInputsTasks.scala b/main/src/main/scala/sbt/coursierint/CoursierInputsTasks.scala
index 4836e1335..655eff843 100644
--- a/main/src/main/scala/sbt/coursierint/CoursierInputsTasks.scala
+++ b/main/src/main/scala/sbt/coursierint/CoursierInputsTasks.scala
@@ -204,7 +204,7 @@ object CoursierInputsTasks {
 
   val credentialsTask = Def.task {
     val log = streams.value.log
-    val creds = sbt.Keys.credentials.value
+    val creds = sbt.Keys.allCredentials.value
       .flatMap {
         case dc: IvyDirectCredentials => List(dc)
         case fc: FileCredentials =>
diff --git a/main/src/main/scala/sbt/coursierint/LMCoursier.scala b/main/src/main/scala/sbt/coursierint/LMCoursier.scala
index f84a19afa..11c9badb3 100644
--- a/main/src/main/scala/sbt/coursierint/LMCoursier.scala
+++ b/main/src/main/scala/sbt/coursierint/LMCoursier.scala
@@ -9,6 +9,7 @@ package sbt
 package coursierint
 
 import java.io.File
+import java.util.concurrent.ConcurrentHashMap
 import lmcoursier.definitions.{
   Classifier,
   Configuration => CConfiguration,
@@ -19,11 +20,15 @@ import lmcoursier._
 import lmcoursier.credentials.Credentials
 import Keys._
 import sbt.librarymanagement._
+import sbt.librarymanagement.ivy.{ Credentials => IvyCredentials }
 import sbt.util.Logger
 import sbt.io.syntax._
 import xsbti.AppConfiguration
 
 object LMCoursier {
+  private[this] val credentialRegistry: ConcurrentHashMap[(String, String), IvyCredentials] =
+    new ConcurrentHashMap
+
   def defaultCacheLocation: File =
     sys.props.get("sbt.coursier.home") match {
       case Some(home) => new File(home).getAbsoluteFile / "cache"
@@ -188,4 +193,19 @@ object LMCoursier {
   def publicationsSetting(packageConfigs: Seq[(Configuration, CConfiguration)]): Def.Setting[_] = {
     csrPublications := CoursierArtifactsTasks.coursierPublicationsTask(packageConfigs: _*).value
   }
+
+  private[sbt] def registerCredentials(creds: IvyCredentials): Unit = {
+    val d = IvyCredentials.toDirect(creds)
+    credentialRegistry.put((d.host, d.realm), d)
+    ()
+  }
+
+  // This emulates Ivy's credential registration which basically keeps mutating global registry
+  def allCredentialsTask: Def.Initialize[Task[Seq[IvyCredentials]]] = Def.task {
+    import scala.collection.JavaConverters._
+    (Keys.credentials in ThisBuild).value foreach registerCredentials
+    (Keys.credentials in LocalRootProject).value foreach registerCredentials
+    Keys.credentials.value foreach registerCredentials
+    credentialRegistry.values.asScala.toVector
+  }
 }