diff --git a/backend.proto b/backend.proto
index 8257c75..a54a947 100644
--- a/backend.proto
+++ b/backend.proto
@@ -27,7 +27,7 @@ message BackendLEDOptions {
 }
 
 message BackendSetChannel {
-    map <int32, int32> new_channel_values = 1;
+    map <int32, double> new_channel_values = 2;
 }
 
 message BackendWrapperMessage {