diff --git a/app/build.gradle b/app/build.gradle
index 6e0ce59..4d39b82 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -44,6 +44,7 @@ android {
         }
     }
     sourceSets {
+        main.java.srcDirs += 'src/main/java'
         main.java.srcDirs += 'src/main/kotlin'
     }
 }