diff --git a/internal/util-logging/src/main/scala/sbt/internal/util/BufferedLogger.scala b/internal/util-logging/src/main/scala/sbt/internal/util/BufferedLogger.scala
index be24152c1..93686c334 100644
--- a/internal/util-logging/src/main/scala/sbt/internal/util/BufferedLogger.scala
+++ b/internal/util-logging/src/main/scala/sbt/internal/util/BufferedLogger.scala
@@ -116,7 +116,9 @@ class BufferedLogger(delegate: AbstractLogger) extends BasicLogger {
   /** Plays buffered events and disables buffering. */
   def stop(): Unit = synchronized { play(); clear() }
 
+  @deprecated("No longer used.", "1.0.0")
   override def ansiCodesSupported = delegate.ansiCodesSupported
+
   override def setLevel(newLevel: Level.Value): Unit = synchronized {
     super.setLevel(newLevel)
     if (recording)
diff --git a/internal/util-logging/src/main/scala/sbt/internal/util/FullLogger.scala b/internal/util-logging/src/main/scala/sbt/internal/util/FullLogger.scala
index 1493e2d0f..c3ad40442 100644
--- a/internal/util-logging/src/main/scala/sbt/internal/util/FullLogger.scala
+++ b/internal/util-logging/src/main/scala/sbt/internal/util/FullLogger.scala
@@ -7,7 +7,9 @@ import sbt.util._
 
 /** Promotes the simple Logger interface to the full AbstractLogger interface. */
 class FullLogger(delegate: Logger) extends BasicLogger {
+  @deprecated("No longer used.", "1.0.0")
   override val ansiCodesSupported: Boolean = delegate.ansiCodesSupported
+
   def trace(t: => Throwable): Unit = {
     if (traceEnabled)
       delegate.trace(t)
diff --git a/internal/util-logging/src/main/scala/sbt/internal/util/ManagedLogger.scala b/internal/util-logging/src/main/scala/sbt/internal/util/ManagedLogger.scala
index a0b69929c..5f284a77a 100644
--- a/internal/util-logging/src/main/scala/sbt/internal/util/ManagedLogger.scala
+++ b/internal/util-logging/src/main/scala/sbt/internal/util/ManagedLogger.scala
@@ -54,5 +54,7 @@ class ManagedLogger(
         new ObjectMessage(entry)
       )
     }
+
+  @deprecated("No longer used.", "1.0.0")
   override def ansiCodesSupported = ConsoleAppender.formatEnabledInEnv
 }
diff --git a/internal/util-logging/src/main/scala/sbt/internal/util/MultiLogger.scala b/internal/util-logging/src/main/scala/sbt/internal/util/MultiLogger.scala
index c72d094af..c43d346f4 100644
--- a/internal/util-logging/src/main/scala/sbt/internal/util/MultiLogger.scala
+++ b/internal/util-logging/src/main/scala/sbt/internal/util/MultiLogger.scala
@@ -9,7 +9,9 @@ import sbt.util._
 // note that setting the logging level on this logger has no effect on its behavior, only
 //   on the behavior of the delegates.
 class MultiLogger(delegates: List[AbstractLogger]) extends BasicLogger {
+  @deprecated("No longer used.", "1.0.0")
   override lazy val ansiCodesSupported = delegates exists supported
+
   private[this] lazy val allSupportCodes = delegates forall supported
   private[this] def supported = (_: AbstractLogger).ansiCodesSupported
 
diff --git a/internal/util-logging/src/main/scala/sbt/util/Logger.scala b/internal/util-logging/src/main/scala/sbt/util/Logger.scala
index abcad3428..0bcea3b78 100644
--- a/internal/util-logging/src/main/scala/sbt/util/Logger.scala
+++ b/internal/util-logging/src/main/scala/sbt/util/Logger.scala
@@ -27,6 +27,7 @@ abstract class Logger extends xLogger {
   // sys.process.ProcessLogger
   final def out(message: => String): Unit = log(Level.Info, message)
 
+  @deprecated("No longer used.", "1.0.0")
   def ansiCodesSupported: Boolean = false
 
   def trace(t: => Throwable): Unit