diff --git a/main/src/main/scala/sbt/internal/LintUnused.scala b/main/src/main/scala/sbt/internal/LintUnused.scala
index a8cafe419..7c732cd06 100644
--- a/main/src/main/scala/sbt/internal/LintUnused.scala
+++ b/main/src/main/scala/sbt/internal/LintUnused.scala
@@ -37,6 +37,7 @@ object LintUnused {
       onUnload,
       sbt.nio.Keys.watchTriggers,
       serverConnectionType,
+      shellPrompt,
     ),
     includeLintKeys := Set(
       scalacOptions,
diff --git a/sbt/src/sbt-test/project/lint/build.sbt b/sbt/src/sbt-test/project/lint/build.sbt
index a8c95a3bd..9ee3171f6 100644
--- a/sbt/src/sbt-test/project/lint/build.sbt
+++ b/sbt/src/sbt-test/project/lint/build.sbt
@@ -1,5 +1,7 @@
 ThisBuild / doc / scalacOptions += "-Xsomething"
 
+ThisBuild / shellPrompt := { state => "sbt> " }
+
 lazy val lintBuildTest = taskKey[Unit]("")
 
 lazy val root = (project in file("."))