diff --git a/build.sbt b/build.sbt
index db0c72eb4..8fe3bd7e7 100644
--- a/build.sbt
+++ b/build.sbt
@@ -765,6 +765,7 @@ lazy val mainProj = (project in file("main"))
       exclude[DirectMissingMethodProblem]("sbt.plugins.SbtPlugin.requires"),
       exclude[DirectMissingMethodProblem]("sbt.ResolvedClasspathDependency.apply"),
       exclude[DirectMissingMethodProblem]("sbt.ClasspathDependency.apply"),
+      exclude[IncompatibleSignatureProblem]("sbt.plugins.SemanticdbPlugin.globalSettings"),
 
       // File -> Source
       exclude[DirectMissingMethodProblem]("sbt.Defaults.cleanFilesTask"),
diff --git a/main/src/main/scala/sbt/plugins/SemanticdbPlugin.scala b/main/src/main/scala/sbt/plugins/SemanticdbPlugin.scala
index 9162901f2..faba09d09 100644
--- a/main/src/main/scala/sbt/plugins/SemanticdbPlugin.scala
+++ b/main/src/main/scala/sbt/plugins/SemanticdbPlugin.scala
@@ -17,14 +17,14 @@ object SemanticdbPlugin extends AutoPlugin {
   override def requires = JvmPlugin
   override def trigger = allRequirements
 
-  override lazy val globalSettings = Seq(
+  override lazy val globalSettings: Seq[Def.Setting[_]] = Seq(
     semanticdbEnabled := false,
     semanticdbIncludeInJar := false,
     semanticdbOptions := List("-Yrangepos"),
     semanticdbVersion := "4.1.0"
   )
 
-  override lazy val projectSettings = Seq(
+  override lazy val projectSettings: Seq[Def.Setting[_]] = Seq(
     semanticdbCompilerPlugin := {
       val v = semanticdbVersion.value
       ("org.scalameta" % "semanticdb-scalac" % v).cross(CrossVersion.full)