diff --git a/compiler/frontend/src/org/jetbrains/kotlin/cfg/ControlFlowInformationProvider.kt b/compiler/frontend/src/org/jetbrains/kotlin/cfg/ControlFlowInformationProvider.kt
index 3875dea7987..7bc8cbdc33b 100644
--- a/compiler/frontend/src/org/jetbrains/kotlin/cfg/ControlFlowInformationProvider.kt
+++ b/compiler/frontend/src/org/jetbrains/kotlin/cfg/ControlFlowInformationProvider.kt
@@ -637,7 +637,9 @@ class ControlFlowInformationProvider private constructor(
             is KtPrimaryConstructor -> if (!element.hasValOrVar()) {
                 val containingClass = owner.getContainingClassOrObject()
                 val containingClassDescriptor = trace.get(DECLARATION_TO_DESCRIPTOR, containingClass) as? ClassDescriptor
-                if (!DescriptorUtils.isAnnotationClass(containingClassDescriptor) && containingClassDescriptor?.isPlatform == false) {
+                if (!DescriptorUtils.isAnnotationClass(containingClassDescriptor) && containingClassDescriptor?.isPlatform == false &&
+                    !DescriptorUtils.isEffectivelyExternal(containingClassDescriptor)
+                ) {
                     report(UNUSED_PARAMETER.on(element, variableDescriptor), ctxt)
                 }
             }
@@ -652,6 +654,7 @@ class ControlFlowInformationProvider private constructor(
                     || functionDescriptor.isOverridableOrOverrides
                     || owner.hasModifier(KtTokens.OVERRIDE_KEYWORD)
                     || functionDescriptor.isPlatform || functionDescriptor.isImpl
+                    || DescriptorUtils.isEffectivelyExternal(functionDescriptor)
                     || OperatorNameConventions.GET_VALUE == functionName
                     || OperatorNameConventions.SET_VALUE == functionName
                     || OperatorNameConventions.PROPERTY_DELEGATED == functionName) {