diff --git a/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/kapt2/simple/build.gradle b/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/kapt2/simple/build.gradle
index 74d0ce6b4ec..4c08899f45c 100644
--- a/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/kapt2/simple/build.gradle
+++ b/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/kapt2/simple/build.gradle
@@ -22,4 +22,6 @@ dependencies {
     compile "org.jetbrains.kotlin:annotation-processor-example:$kotlin_version"
     kapt "org.jetbrains.kotlin:annotation-processor-example:$kotlin_version"
     testCompile 'junit:junit:4.12'
-}
\ No newline at end of file
+}
+
+compileKotlin.kotlinOptions.allWarningsAsErrors = true
\ No newline at end of file
diff --git a/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/internal/kapt/KaptTask.kt b/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/internal/kapt/KaptTask.kt
index dd62a2e4582..04fb4a89099 100644
--- a/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/internal/kapt/KaptTask.kt
+++ b/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/internal/kapt/KaptTask.kt
@@ -74,6 +74,7 @@ abstract class KaptTask : ConventionTask() {
             .filterTo(HashSet(), ::isRootAllowed)
 
     private fun isRootAllowed(file: File): Boolean =
-        !FileUtil.isAncestor(destinationDir, file, /* strict = */ false) &&
+        file.exists() &&
+                !FileUtil.isAncestor(destinationDir, file, /* strict = */ false) &&
                 !FileUtil.isAncestor(classesDir, file, /* strict = */ false)
 }
\ No newline at end of file