diff --git a/app/src/main/java/org/hydev/wearsync/bles/BluetoothHandler.kt b/app/src/main/java/org/hydev/wearsync/bles/BluetoothHandler.kt
index e92e076..39e5652 100644
--- a/app/src/main/java/org/hydev/wearsync/bles/BluetoothHandler.kt
+++ b/app/src/main/java/org/hydev/wearsync/bles/BluetoothHandler.kt
@@ -32,8 +32,8 @@ internal class BluetoothHandler private constructor(context: Context) {
 
     val listeners = HashMap<KClass<*>, MutableList<(Any) -> Unit>>()
 
-    inline fun <M : Any, reified D : IDecoder<M>> observe(crossinline cb: (M) -> Unit)
-    {
+    @Suppress("UNCHECKED_CAST")
+    inline fun <M : Any, reified D : IDecoder<M>> observe(crossinline cb: (M) -> Unit) {
         (listeners[D::class] ?: error("Cannot observe unknown decoder class ${D::class}"))
             .add { cb(it as M) }
     }