diff --git a/ivy/src/main/scala/sbt/Credentials.scala b/ivy/src/main/scala/sbt/Credentials.scala
index fd6a85538..464d5de8e 100644
--- a/ivy/src/main/scala/sbt/Credentials.scala
+++ b/ivy/src/main/scala/sbt/Credentials.scala
@@ -27,7 +27,7 @@ object Credentials {
   def toDirect(c: Credentials): DirectCredentials = c match {
     case dc: DirectCredentials => dc
     case fc: FileCredentials => loadCredentials(fc.path) match {
-      case Left(err) => error(err)
+      case Left(err) => sys.error(err)
       case Right(dc) => dc
     }
   }
diff --git a/ivy/src/main/scala/sbt/EvictionWarning.scala b/ivy/src/main/scala/sbt/EvictionWarning.scala
index c40860081..25ad9014b 100644
--- a/ivy/src/main/scala/sbt/EvictionWarning.scala
+++ b/ivy/src/main/scala/sbt/EvictionWarning.scala
@@ -155,7 +155,7 @@ object EvictionWarning {
     val transitiveEvictions: mutable.ListBuffer[EvictionPair] = mutable.ListBuffer()
     def guessCompatible(p: EvictionPair): Boolean =
       p.evicteds forall { r =>
-        options.guessCompatible(r.module, p.winner map { _.module }, module.moduleSettings.ivyScala)
+        options.guessCompatible((r.module, p.winner map { _.module }, module.moduleSettings.ivyScala))
       }
     pairs foreach {
       case p if isScalaArtifact(module, p.organization, p.name) =>
diff --git a/ivy/src/main/scala/sbt/IvyActions.scala b/ivy/src/main/scala/sbt/IvyActions.scala
index f5e57336d..c1e8bccf4 100644
--- a/ivy/src/main/scala/sbt/IvyActions.scala
+++ b/ivy/src/main/scala/sbt/IvyActions.scala
@@ -313,7 +313,7 @@ object IvyActions {
   private[this] def checkFilesPresent(artifacts: Seq[(IArtifact, File)]) {
     val missing = artifacts filter { case (a, file) => !file.exists }
     if (missing.nonEmpty)
-      error("Missing files for publishing:\n\t" + missing.map(_._2.getAbsolutePath).mkString("\n\t"))
+      sys.error("Missing files for publishing:\n\t" + missing.map(_._2.getAbsolutePath).mkString("\n\t"))
   }
 }
 final class ResolveException(
diff --git a/ivy/src/main/scala/sbt/UpdateReport.scala b/ivy/src/main/scala/sbt/UpdateReport.scala
index 443c84ed3..dbd913620 100644
--- a/ivy/src/main/scala/sbt/UpdateReport.scala
+++ b/ivy/src/main/scala/sbt/UpdateReport.scala
@@ -220,7 +220,7 @@ object UpdateReport {
 
     private[this] def select0(f: DependencyFilter): Seq[File] =
       for (cReport <- report.configurations; mReport <- cReport.modules; (artifact, file) <- mReport.artifacts if f(cReport.configuration, mReport.module, artifact)) yield {
-        if (file == null) error("Null file: conf=" + cReport.configuration + ", module=" + mReport.module + ", art: " + artifact)
+        if (file == null) sys.error("Null file: conf=" + cReport.configuration + ", module=" + mReport.module + ", art: " + artifact)
         file
       }