diff --git a/buildSrc/src/main/kotlin/io/spine/gradle/protobuf/ProtoTaskExtensions.kt b/buildSrc/src/main/kotlin/io/spine/gradle/protobuf/ProtoTaskExtensions.kt
index f5fa9326..8d75d8f6 100644
--- a/buildSrc/src/main/kotlin/io/spine/gradle/protobuf/ProtoTaskExtensions.kt
+++ b/buildSrc/src/main/kotlin/io/spine/gradle/protobuf/ProtoTaskExtensions.kt
@@ -352,6 +352,7 @@ val Project.generatedSourceProtoDir: Path
  * IDEA should only see the sources generated by ProtoData as
  * we define in [GenerateProtoTask.excludeProtocOutput].
  */
+@Suppress("unused")
 fun Project.configureIdea() {
 
     fun filterSources(sources: Set<File>, excludeDir: File): Set<File> =