diff --git a/testing/src/main/scala/sbt/JUnitXmlTestsListener.scala b/testing/src/main/scala/sbt/JUnitXmlTestsListener.scala
index d8e0bfa2b..1a3cf42e9 100644
--- a/testing/src/main/scala/sbt/JUnitXmlTestsListener.scala
+++ b/testing/src/main/scala/sbt/JUnitXmlTestsListener.scala
@@ -51,7 +51,7 @@ class JUnitXmlTestsListener(val outputDir: String, legacyTestReport: Boolean, lo
       logger.warn(
         s"Getting the hostname $name was slow (${elapsed / 1.0e6} ms). " +
           "This is likely because the computer's hostname is not set. You can set the " +
-          "hostname with the command: scutil --set HostName $(scutil --get LocalHostName)."
+          """hostname with the command: scutil --set HostName "$(scutil --get LocalHostName).local"."""
       )
     }
     name