diff --git a/idea/src/org/jetbrains/kotlin/idea/highlighter/KotlinDefaultHighlightingSettingsProvider.kt b/idea/src/org/jetbrains/kotlin/idea/highlighter/KotlinDefaultHighlightingSettingsProvider.kt
index 774e4a2da38..d860907c385 100644
--- a/idea/src/org/jetbrains/kotlin/idea/highlighter/KotlinDefaultHighlightingSettingsProvider.kt
+++ b/idea/src/org/jetbrains/kotlin/idea/highlighter/KotlinDefaultHighlightingSettingsProvider.kt
@@ -14,8 +14,8 @@ import org.jetbrains.kotlin.idea.util.ProjectRootsUtil
 class KotlinDefaultHighlightingSettingsProvider : DefaultHighlightingSettingProvider() {
     override fun getDefaultSetting(project: Project, file: VirtualFile): FileHighlightingSetting? {
         return when {
-            ProjectRootsUtil.isProjectSourceFile(project, file) -> null
-            else -> FileHighlightingSetting.SKIP_INSPECTION
+            ProjectRootsUtil.isLibraryFile(project, file) -> FileHighlightingSetting.SKIP_INSPECTION
+            else -> null
         }
     }
 }
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