diff --git a/libraries/tools/kotlin-gradle-plugin-core/kotlinAnnotation/org/gradle/api/file/annotations.xml b/libraries/tools/kotlin-gradle-plugin-core/kotlinAnnotation/org/gradle/api/file/annotations.xml
index 86cc0e5f0c1..10a2d3e4183 100644
--- a/libraries/tools/kotlin-gradle-plugin-core/kotlinAnnotation/org/gradle/api/file/annotations.xml
+++ b/libraries/tools/kotlin-gradle-plugin-core/kotlinAnnotation/org/gradle/api/file/annotations.xml
@@ -2,6 +2,18 @@
     <item name='org.gradle.api.file.FileCollection org.gradle.api.file.FileCollection filter(org.gradle.api.specs.Spec&lt;? super java.io.File&gt;)'>
         <annotation name='org.jetbrains.annotations.NotNull'/>
     </item>
+    <item name='org.gradle.api.file.FileCollection org.gradle.api.file.FileCollection minus(org.gradle.api.file.FileCollection)'>
+        <annotation name='org.jetbrains.annotations.NotNull'/>
+    </item>
+    <item name='org.gradle.api.file.FileCollection org.gradle.api.file.FileCollection minus(org.gradle.api.file.FileCollection) 0'>
+        <annotation name='org.jetbrains.annotations.NotNull'/>
+    </item>
+    <item name='org.gradle.api.file.FileCollection org.gradle.api.file.FileCollection plus(org.gradle.api.file.FileCollection)'>
+        <annotation name='org.jetbrains.annotations.NotNull'/>
+    </item>
+    <item name='org.gradle.api.file.FileCollection org.gradle.api.file.FileCollection plus(org.gradle.api.file.FileCollection) 0'>
+        <annotation name='org.jetbrains.annotations.NotNull'/>
+    </item>
     <item name='org.gradle.api.file.SourceDirectorySet java.util.Set&lt;java.io.File&gt; getSrcDirs()'>
         <annotation name='org.jetbrains.annotations.NotNull'/>
     </item>
diff --git a/libraries/tools/kotlin-gradle-plugin-core/src/main/kotlin/org/jetbrains/kotlin/gradle/plugin/KotlinPlugin.kt b/libraries/tools/kotlin-gradle-plugin-core/src/main/kotlin/org/jetbrains/kotlin/gradle/plugin/KotlinPlugin.kt
index 9a70c6b42b2..1c4e42ca784 100644
--- a/libraries/tools/kotlin-gradle-plugin-core/src/main/kotlin/org/jetbrains/kotlin/gradle/plugin/KotlinPlugin.kt
+++ b/libraries/tools/kotlin-gradle-plugin-core/src/main/kotlin/org/jetbrains/kotlin/gradle/plugin/KotlinPlugin.kt
@@ -248,7 +248,7 @@ open class KotlinAndroidPlugin: Plugin<Project> {
                     val basePlugin : BasePlugin = plugin as BasePlugin
                     val javaSources = project.files(javaSourceList)
                     val androidRT = project.files(basePlugin.getRuntimeJarList())
-                    val fullClasspath = javaTask.getClasspath() + (javaSources + androidRT)?.minus(project.files(kotlinTask.kotlinDestinationDir))
+                    val fullClasspath = (javaTask.getClasspath() + (javaSources + androidRT)) - project.files(kotlinTask.kotlinDestinationDir)
                     (task as AbstractCompile).setClasspath(fullClasspath)
                 })