diff --git a/src/main/scala/scalafix/sbt/ScalafixPlugin.scala b/src/main/scala/scalafix/sbt/ScalafixPlugin.scala
index 1f4cb6d0..1886420b 100644
--- a/src/main/scala/scalafix/sbt/ScalafixPlugin.scala
+++ b/src/main/scala/scalafix/sbt/ScalafixPlugin.scala
@@ -67,7 +67,7 @@ object ScalafixPlugin extends AutoPlugin {
     val scalafixScalaBinaryVersion: SettingKey[String] =
       settingKey[String](
         "The Scala binary version used for scalafix execution. Can be set in ThisBuild or at project-level. " +
-          "Custom rules must be compiled against that binary version. Defaults to 2.12."
+          "Custom rules must be compiled against that binary version. Defaults to scalaBinaryVersion."
       )
     val scalafixConfig: SettingKey[Option[File]] =
       settingKey[Option[File]](
@@ -266,6 +266,7 @@ object ScalafixPlugin extends AutoPlugin {
   )
 
   override lazy val globalSettings: Seq[Def.Setting[_]] = Seq(
+    Def.derive(scalafixScalaBinaryVersion := scalaBinaryVersion.value),
     scalafixCallback := new ScalafixLogger(ScalafixInterface.defaultLogger),
     scalafixConfig := None, // let scalafix-cli try to infer $CWD/.scalafix.conf
     scalafixOnCompile := false,
@@ -300,7 +301,6 @@ object ScalafixPlugin extends AutoPlugin {
           )
         }
       },
-      scalafixScalaBinaryVersion := "2.12",
       scalafixJGitCompletion := new JGitCompletion(baseDirectory.value.toPath)
     )