diff --git a/app/build.gradle b/app/build.gradle
index cd082c6..e2be21c 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -25,6 +25,9 @@
     dataBinding {
         enabled = true
     }
+    sourceSets {
+        main.java.srcDirs += 'src/main/kotlin'
+    }
 }
 
 dependencies {
diff --git a/app/src/main/java/jackall/overlaymulticounter/MainActivity.kt b/app/src/main/java/jackall/overlaymulticounter/MainActivity.kt
deleted file mode 100644
index f5e6374..0000000
--- a/app/src/main/java/jackall/overlaymulticounter/MainActivity.kt
+++ /dev/null
@@ -1,12 +0,0 @@
-package jackall.overlaymulticounter
-
-import android.support.v7.app.AppCompatActivity
-import android.os.Bundle
-
-class MainActivity : AppCompatActivity() {
-
-    override fun onCreate(savedInstanceState: Bundle?) {
-        super.onCreate(savedInstanceState)
-        setContentView(R.layout.activity_main)
-    }
-}
diff --git a/app/src/main/kotlin/jackall/overlaymulticounter/MainActivity.kt b/app/src/main/kotlin/jackall/overlaymulticounter/MainActivity.kt
new file mode 100644
index 0000000..f5e6374
--- /dev/null
+++ b/app/src/main/kotlin/jackall/overlaymulticounter/MainActivity.kt
@@ -0,0 +1,12 @@
+package jackall.overlaymulticounter
+
+import android.support.v7.app.AppCompatActivity
+import android.os.Bundle
+
+class MainActivity : AppCompatActivity() {
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_main)
+    }
+}