diff --git a/Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/ui/main/ThemeProvider.java b/Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/ui/main/ThemeProvider.java
deleted file mode 100644
index 1be137f33e..0000000000
--- a/Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/ui/main/ThemeProvider.java
+++ /dev/null
@@ -1,9 +0,0 @@
-package org.dolphinemu.dolphinemu.ui.main;
-
-public interface ThemeProvider
-{
-  /**
-   * Provides theme ID by overriding an activity's 'setTheme' method and returning that result
-   */
-  int getThemeId();
-}
diff --git a/Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/ui/main/ThemeProvider.kt b/Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/ui/main/ThemeProvider.kt
new file mode 100644
index 0000000000..b49011a987
--- /dev/null
+++ b/Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/ui/main/ThemeProvider.kt
@@ -0,0 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+package org.dolphinemu.dolphinemu.ui.main
+
+interface ThemeProvider {
+    /**
+     * Provides theme ID by overriding an activity's 'setTheme' method and returning that result
+     */
+    val themeId: Int
+}