diff --git a/src/reskit/soundtrack/engines/echo/engine.rs b/src/reskit/soundtrack/engines/echo/engine.rs
index 23c54a5..e18282e 100644
--- a/src/reskit/soundtrack/engines/echo/engine.rs
+++ b/src/reskit/soundtrack/engines/echo/engine.rs
@@ -506,7 +506,7 @@ fn apply_effects_to_channel( channel: &mut Channel, effects: &LinkedHashSet<Effe
 
                         // Insert new panning commands
                         let panning: u8 = if left && right {
-                            ESF_FM_PARAM_LEFT_SPEAKER & ESF_FM_PARAM_RIGHT_SPEAKER
+                            ESF_FM_PARAM_LEFT_SPEAKER | ESF_FM_PARAM_RIGHT_SPEAKER
                         } else if left {
                             ESF_FM_PARAM_LEFT_SPEAKER
                         } else if right {