diff --git a/compiler/plugin-api/src/org/jetbrains/kotlin/compiler/plugin/CommandLineProcessor.kt b/compiler/plugin-api/src/org/jetbrains/kotlin/compiler/plugin/CommandLineProcessor.kt
index 73f03e1cfaa..c763ed5bcb4 100644
--- a/compiler/plugin-api/src/org/jetbrains/kotlin/compiler/plugin/CommandLineProcessor.kt
+++ b/compiler/plugin-api/src/org/jetbrains/kotlin/compiler/plugin/CommandLineProcessor.kt
@@ -18,7 +18,7 @@ package org.jetbrains.kotlin.compiler.plugin
 
 import org.jetbrains.kotlin.config.CompilerConfiguration
 
-public trait CommandLineProcessor {
+public interface CommandLineProcessor {
     public val pluginId: String
     public val pluginOptions: Collection<CliOption>
 
diff --git a/compiler/plugin-api/src/org/jetbrains/kotlin/compiler/plugin/ComponentRegistrar.kt b/compiler/plugin-api/src/org/jetbrains/kotlin/compiler/plugin/ComponentRegistrar.kt
index 3d91596226d..60e7dedf640 100644
--- a/compiler/plugin-api/src/org/jetbrains/kotlin/compiler/plugin/ComponentRegistrar.kt
+++ b/compiler/plugin-api/src/org/jetbrains/kotlin/compiler/plugin/ComponentRegistrar.kt
@@ -20,7 +20,7 @@ import com.intellij.mock.MockProject
 import org.jetbrains.kotlin.config.CompilerConfigurationKey
 import org.jetbrains.kotlin.config.CompilerConfiguration
 
-public trait ComponentRegistrar {
+public interface ComponentRegistrar {
     companion object {
         public val PLUGIN_COMPONENT_REGISTRARS: CompilerConfigurationKey<MutableList<ComponentRegistrar>> = CompilerConfigurationKey.create("plugin component registrars")
     }